Fluorine Manager: full Linux port of Mod Organizer 2

Complete native Linux port with FUSE-based virtual filesystem,
Proton/umu-run integration, and Flatpak packaging.

Key features:
- FUSE VFS replacing Windows USVFS (in-process + standalone helper for Flatpak)
- Proton/GE-Proton/umu-run launcher with env var forwarding
- Flatpak support (sandbox-aware VFS, NXM handler, umu-run)
- Wine prefix management UI
- Case-insensitive path resolution for Linux filesystems
- QSettings-safe INI handling (avoids Bethesda INI corruption)
- Portable instance support with auto-generated launcher scripts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

94 files changed, 117 insertions, 0 deletions

diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rcopyme4.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rcopyme4.txt
new file mode 100644
index 0000000..d1e44e9
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rcopyme4.txt
@@ -0,0 +1 @@
+rfolder\rcopyme4.txt original contents
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfile0.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfile0.txt
new file mode 100644
index 0000000..9830306
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfile0.txt
@@ -0,0 +1 @@
+rfolder\rfile0.txt original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfiledeletewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfiledeletewrite.txt
new file mode 100644
index 0000000..2743678
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfiledeletewrite.txt
@@ -0,0 +1 @@
+rfolder\rfiledeletewrite.txt overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfilerewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfilerewrite.txt
new file mode 100644
index 0000000..bdff476
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfilerewrite.txt
@@ -0,0 +1 @@
+rfolder\rfilerewrite.txt rewrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root0.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root0.txt
new file mode 100644
index 0000000..a52b6be
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root0.txt
@@ -0,0 +1 @@
+root0 original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root0w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root0w.txt
new file mode 100644
index 0000000..c177584
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root0w.txt
@@ -0,0 +1 @@
+root0w original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root1.txt
new file mode 100644
index 0000000..06dc692
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root1.txt
@@ -0,0 +1 @@
+root1 original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root1w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root1w.txt
new file mode 100644
index 0000000..45172aa
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root1w.txt
@@ -0,0 +1 @@
+root1w original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rcopyme4.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rcopyme4.txt
new file mode 100644
index 0000000..d1e44e9
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rcopyme4.txt
@@ -0,0 +1 @@
+rfolder\rcopyme4.txt original contents
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfile0.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfile0.txt
new file mode 100644
index 0000000..9830306
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfile0.txt
@@ -0,0 +1 @@
+rfolder\rfile0.txt original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfiledelete.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfiledelete.txt
new file mode 100644
index 0000000..c19828f
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfiledelete.txt
@@ -0,0 +1 @@
+rfolder\rfiledelete.txt original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfiledeletewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfiledeletewrite.txt
new file mode 100644
index 0000000..93861cc
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfiledeletewrite.txt
@@ -0,0 +1 @@
+rfolder\rfiledeletewrite.txt orignal file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfileoldname.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfileoldname.txt
new file mode 100644
index 0000000..9376ea1
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfileoldname.txt
@@ -0,0 +1 @@
+rfolder\rfileoldname.txt original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfilerewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfilerewrite.txt
new file mode 100644
index 0000000..499775d
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfilerewrite.txt
@@ -0,0 +1 @@
+rfolder\rfilerewrite.txt original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root0.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root0.txt
new file mode 100644
index 0000000..a52b6be
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root0.txt
@@ -0,0 +1 @@
+root0 original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root0w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root0w.txt
new file mode 100644
index 0000000..c177584
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root0w.txt
@@ -0,0 +1 @@
+root0w original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root1.txt
new file mode 100644
index 0000000..06dc692
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root1.txt
@@ -0,0 +1 @@
+root1 original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root1w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root1w.txt
new file mode 100644
index 0000000..45172aa
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root1w.txt
@@ -0,0 +1 @@
+root1w original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder1/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder1/mfile.txt
new file mode 100644
index 0000000..227256a
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder1/mfile.txt
@@ -0,0 +1 @@
+mfolder1\mfile.txt by mod1
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder1/mfilew.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder1/mfilew.txt
new file mode 100644
index 0000000..420589d
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder1/mfilew.txt
@@ -0,0 +1 @@
+mfolder1\mfilew.txt by mod1
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder3/mdeep3/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder3/mdeep3/mfile.txt
new file mode 100644
index 0000000..6a7a0c2
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder3/mdeep3/mfile.txt
@@ -0,0 +1 @@
+mfolder3\mdeep3\mfile.txt by mod1 (to be hidden by mod3)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mod1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mod1.txt
new file mode 100644
index 0000000..7d5dc0e
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mod1.txt
@@ -0,0 +1 @@
+hello mod1
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mod1w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mod1w.txt
new file mode 100644
index 0000000..1838cdf
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mod1w.txt
@@ -0,0 +1 @@
+hello mod1w
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder2/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder2/mfile.txt
new file mode 100644
index 0000000..8ff096e
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder2/mfile.txt
@@ -0,0 +1 @@
+mfolder2\mfile.txt by mod2
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfile.txt
new file mode 100644
index 0000000..c0f0f2c
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfile.txt
@@ -0,0 +1 @@
+mfolder4\mfile.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletemove.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletemove.txt
new file mode 100644
index 0000000..e35f1f3
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletemove.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletemove.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletemove2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletemove2p.txt
new file mode 100644
index 0000000..cc572dc
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletemove2p.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletemove2p.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletewrite.txt
new file mode 100644
index 0000000..f699360
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletewrite.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletewrite.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletewrite2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletewrite2p.txt
new file mode 100644
index 0000000..9eae9c5
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletewrite2p.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletewrite2p.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfilemoveover.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfilemoveover.txt
new file mode 100644
index 0000000..88a6d08
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfilemoveover.txt
@@ -0,0 +1 @@
+mfolder4/mfilemoveover.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfileoverwrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfileoverwrite.txt
new file mode 100644
index 0000000..61b92a6
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfileoverwrite.txt
@@ -0,0 +1 @@
+mfolder4\mfileoverwrite.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfilerewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfilerewrite.txt
new file mode 100644
index 0000000..727a48f
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfilerewrite.txt
@@ -0,0 +1 @@
+mfolder4\mfilerewrite.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mod2.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mod2.txt
new file mode 100644
index 0000000..49bbbf1
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mod2.txt
@@ -0,0 +1 @@
+hello mod2
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mfolder3/mdeep3/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mfolder3/mdeep3/mfile.txt
new file mode 100644
index 0000000..fac8213
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mfolder3/mdeep3/mfile.txt
@@ -0,0 +1 @@
+mfolder3\mdeep3\mfile.txt by mod3
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mfolder4/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mfolder4/mfile.txt
new file mode 100644
index 0000000..5e6ca00
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mfolder4/mfile.txt
@@ -0,0 +1 @@
+mfolder4\mfile.txt by mod3 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mod3.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mod3.txt
new file mode 100644
index 0000000..47fbacd
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mod3.txt
@@ -0,0 +1 @@
+hello mod3
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfile.txt
new file mode 100644
index 0000000..c67ecfe
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfile.txt
@@ -0,0 +1 @@
+mfolder4\mfile.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfiledeletemove.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfiledeletemove.txt
new file mode 100644
index 0000000..00cc0cd
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfiledeletemove.txt
@@ -0,0 +1 @@
+mfolder4\mfiledeletemove.txt overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfiledeletewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfiledeletewrite.txt
new file mode 100644
index 0000000..083a6b8
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfiledeletewrite.txt
@@ -0,0 +1 @@
+mfolder4\mfiledeletewrite.txt overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfilemoveover.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfilemoveover.txt
new file mode 100644
index 0000000..a8a93c2
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfilemoveover.txt
@@ -0,0 +1 @@
+mfolder4\mfilemoveover.txt overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfileoverwrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfileoverwrite.txt
new file mode 100644
index 0000000..fc6d42f
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfileoverwrite.txt
@@ -0,0 +1 @@
+mfolder4\mfileoverwrite.txt overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfilerewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfilerewrite.txt
new file mode 100644
index 0000000..a3b8ced
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfilerewrite.txt
@@ -0,0 +1 @@
+mfolder4\mfilerewrite.txt rewrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/.empty b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/.empty
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/.empty
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder1/newfile1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder1/newfile1.txt
new file mode 100644
index 0000000..bf76f1d
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder1/newfile1.txt
@@ -0,0 +1 @@
+newfile1.txt nonrecursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder1/newfolder1/newfile1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder1/newfolder1/newfile1.txt
new file mode 100644
index 0000000..4802577
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder1/newfolder1/newfile1.txt
@@ -0,0 +1 @@
+newfile1.txt nonrecursive overwrite subfolder
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder2/newfile2.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder2/newfile2.txt
new file mode 100644
index 0000000..a4fa7fc
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder2/newfile2.txt
@@ -0,0 +1 @@
+newfile2.txt recursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder3/newfolder3/newfile3.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder3/newfolder3/newfile3.txt
new file mode 100644
index 0000000..933eb0c
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder3/newfolder3/newfile3.txt
@@ -0,0 +1 @@
+newfile3.txt recursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder3/newfolder3/newfile3e.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder3/newfolder3/newfile3e.txt
new file mode 100644
index 0000000..5e5286a
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder3/newfolder3/newfile3e.txt
@@ -0,0 +1 @@
+newfile3e.txt recursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/mfiledeletemove2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/mfiledeletemove2p.txt
new file mode 100644
index 0000000..6b85a92
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/mfiledeletemove2p.txt
@@ -0,0 +1 @@
+mfolder4\mfiledeletemove2p.txt overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/mfiledeletewrite2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/mfiledeletewrite2p.txt
new file mode 100644
index 0000000..64cac84
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/mfiledeletewrite2p.txt
@@ -0,0 +1 @@
+mfolder4\mfiledeletewrite2p.txt overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4.txt
new file mode 100644
index 0000000..cba5361
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4.txt
@@ -0,0 +1 @@
+newfile4.txt recursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4e.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4e.txt
new file mode 100644
index 0000000..eb90089
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4e.txt
@@ -0,0 +1 @@
+newfile4e.txt recursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4enr.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4enr.txt
new file mode 100644
index 0000000..f8b5f9f
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4enr.txt
@@ -0,0 +1 @@
+newfile4enr.txt nonrecursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/epnewfile4.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/epnewfile4.txt
new file mode 100644
index 0000000..06edab8
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/epnewfile4.txt
@@ -0,0 +1 @@
+epnewfile4.txt nonrecursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/epnewfile4r.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/epnewfile4r.txt
new file mode 100644
index 0000000..8fd183d
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/epnewfile4r.txt
@@ -0,0 +1 @@
+epnewfile4r.txt recursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4p/rcopyme4.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4p/rcopyme4.txt
new file mode 100644
index 0000000..d1e44e9
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4p/rcopyme4.txt
@@ -0,0 +1 @@
+rfolder\rcopyme4.txt original contents
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/rcopyme4.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/rcopyme4.txt
new file mode 100644
index 0000000..d1e44e9
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/rcopyme4.txt
@@ -0,0 +1 @@
+rfolder\rcopyme4.txt original contents
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/rfolder/rfilenewname.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/rfolder/rfilenewname.txt
new file mode 100644
index 0000000..9376ea1
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/rfolder/rfilenewname.txt
@@ -0,0 +1 @@
+rfolder\rfileoldname.txt original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root1.txt
new file mode 100644
index 0000000..5aa129b
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root1.txt
@@ -0,0 +1 @@
+root1 source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root1w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root1w.txt
new file mode 100644
index 0000000..0c04aa5
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root1w.txt
@@ -0,0 +1 @@
+root1w source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root2.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root2.txt
new file mode 100644
index 0000000..4ac40bb
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root2.txt
@@ -0,0 +1 @@
+root2 source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root2w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root2w.txt
new file mode 100644
index 0000000..83ddb42
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root2w.txt
@@ -0,0 +1 @@
+root2w source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder1/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder1/mfile.txt
new file mode 100644
index 0000000..227256a
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder1/mfile.txt
@@ -0,0 +1 @@
+mfolder1\mfile.txt by mod1
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder1/mfilew.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder1/mfilew.txt
new file mode 100644
index 0000000..420589d
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder1/mfilew.txt
@@ -0,0 +1 @@
+mfolder1\mfilew.txt by mod1
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder3/mdeep3/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder3/mdeep3/mfile.txt
new file mode 100644
index 0000000..6a7a0c2
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder3/mdeep3/mfile.txt
@@ -0,0 +1 @@
+mfolder3\mdeep3\mfile.txt by mod1 (to be hidden by mod3)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mod1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mod1.txt
new file mode 100644
index 0000000..7d5dc0e
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mod1.txt
@@ -0,0 +1 @@
+hello mod1
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mod1w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mod1w.txt
new file mode 100644
index 0000000..1838cdf
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mod1w.txt
@@ -0,0 +1 @@
+hello mod1w
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder2/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder2/mfile.txt
new file mode 100644
index 0000000..8ff096e
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder2/mfile.txt
@@ -0,0 +1 @@
+mfolder2\mfile.txt by mod2
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfile.txt
new file mode 100644
index 0000000..c0f0f2c
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfile.txt
@@ -0,0 +1 @@
+mfolder4\mfile.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletemove.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletemove.txt
new file mode 100644
index 0000000..e35f1f3
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletemove.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletemove.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletemove2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletemove2p.txt
new file mode 100644
index 0000000..cc572dc
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletemove2p.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletemove2p.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletewrite.txt
new file mode 100644
index 0000000..f699360
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletewrite.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletewrite.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletewrite2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletewrite2p.txt
new file mode 100644
index 0000000..9eae9c5
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletewrite2p.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletewrite2p.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfilemoveover.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfilemoveover.txt
new file mode 100644
index 0000000..88a6d08
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfilemoveover.txt
@@ -0,0 +1 @@
+mfolder4/mfilemoveover.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfileoverwrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfileoverwrite.txt
new file mode 100644
index 0000000..61b92a6
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfileoverwrite.txt
@@ -0,0 +1 @@
+mfolder4\mfileoverwrite.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfilerewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfilerewrite.txt
new file mode 100644
index 0000000..727a48f
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfilerewrite.txt
@@ -0,0 +1 @@
+mfolder4\mfilerewrite.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mod2.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mod2.txt
new file mode 100644
index 0000000..49bbbf1
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mod2.txt
@@ -0,0 +1 @@
+hello mod2
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mfolder3/mdeep3/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mfolder3/mdeep3/mfile.txt
new file mode 100644
index 0000000..fac8213
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mfolder3/mdeep3/mfile.txt
@@ -0,0 +1 @@
+mfolder3\mdeep3\mfile.txt by mod3
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mfolder4/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mfolder4/mfile.txt
new file mode 100644
index 0000000..5e6ca00
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mfolder4/mfile.txt
@@ -0,0 +1 @@
+mfolder4\mfile.txt by mod3 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mod3.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mod3.txt
new file mode 100644
index 0000000..47fbacd
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mod3.txt
@@ -0,0 +1 @@
+hello mod3
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfile.txt
new file mode 100644
index 0000000..c67ecfe
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfile.txt
@@ -0,0 +1 @@
+mfolder4\mfile.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletemove.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletemove.txt
new file mode 100644
index 0000000..657f07d
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletemove.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletemove.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletemove2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletemove2p.txt
new file mode 100644
index 0000000..cfd08dd
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletemove2p.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletemove2p.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletewrite.txt
new file mode 100644
index 0000000..a17d129
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletewrite.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletewrite.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletewrite2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletewrite2p.txt
new file mode 100644
index 0000000..b198d1c
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletewrite2p.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletewrite2p.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfilemoveover.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfilemoveover.txt
new file mode 100644
index 0000000..b395908
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfilemoveover.txt
@@ -0,0 +1 @@
+mfolder4/mfilemoveover.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfileoverwrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfileoverwrite.txt
new file mode 100644
index 0000000..405c0c1
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfileoverwrite.txt
@@ -0,0 +1 @@
+mfolder4\mfileoverwrite.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfilerewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfilerewrite.txt
new file mode 100644
index 0000000..def973c
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfilerewrite.txt
@@ -0,0 +1 @@
+mfolder4\mfilerewrite.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/overwrite/.empty b/libs/usvfs/test/fixtures/usvfs_test/basic/source/overwrite/.empty
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/overwrite/.empty
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/root1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root1.txt
new file mode 100644
index 0000000..5aa129b
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root1.txt
@@ -0,0 +1 @@
+root1 source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/root1w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root1w.txt
new file mode 100644
index 0000000..0c04aa5
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root1w.txt
@@ -0,0 +1 @@
+root1w source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/root2.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root2.txt
new file mode 100644
index 0000000..4ac40bb
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root2.txt
@@ -0,0 +1 @@
+root2 source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/root2w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root2w.txt
new file mode 100644
index 0000000..83ddb42
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root2w.txt
@@ -0,0 +1 @@
+root2w source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/vfs_mappings.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/vfs_mappings.txt
new file mode 100644
index 0000000..cc755b4
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/vfs_mappings.txt
@@ -0,0 +1,26 @@
+# mapdir <optional relative path under mount>
+#   <relative path under source to mount>
+#   ...
+mapdir
+  mod1
+  mod2
+  mod3
+  mod4
+
+# mapdircreate <optional relative path under mount>
+#   <relative path under source to mount>
+#   ...
+mapdircreate
+  overwrite
+
+# mapfile <optional relative path under mount>
+#   <relative path under source to mount>
+#   ...
+mapfile root1.txt
+  root1.txt
+mapfile root1w.txt
+  root1w.txt
+mapfile root2.txt
+  root2.txt
+mapfile root2w.txt
+  root2w.txt