5 files changed, 60 insertions, 2 deletions
diff --git a/src/aboutdialog.cpp b/src/aboutdialog.cpp
index 41fd24f7..6ae7f56d 100644
--- a/src/aboutdialog.cpp
+++ b/src/aboutdialog.cpp
@@ -20,6 +20,7 @@ along with Mod Organizer.  If not, see <http://www.gnu.org/licenses/>.
 
 #include "aboutdialog.h"
 #include "ui_aboutdialog.h"
+#include "util.h"
 #include <utility.h>
 
 #include <QApplication>
@@ -85,6 +86,8 @@ AboutDialog::AboutDialog(const QString &version, QWidget *parent)
   ui->revisionLabel->setText(ui->revisionLabel->text() + " unknown");
 #endif
 
+
+  ui->usvfsLabel->setText(ui->usvfsLabel->text() + " " + MOShared::getUsvfsVersionString());
   ui->licenseText->setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
 }
 
diff --git a/src/aboutdialog.ui b/src/aboutdialog.ui
index c72a85f8..415ce0a7 100644
--- a/src/aboutdialog.ui
+++ b/src/aboutdialog.ui
@@ -105,6 +105,13 @@
           </widget>
          </item>
          <item>
+          <widget class="QLabel" name="usvfsLabel">
+           <property name="text">
+            <string>usvfs:</string>
+           </property>
+          </widget>
+         </item>
+         <item>
           <spacer name="verticalSpacer">
            <property name="orientation">
             <enum>Qt::Vertical</enum>
diff --git a/src/main.cpp b/src/main.cpp
index f08ba066..776c3775 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -504,8 +504,9 @@ int runApplication(MOApplication &application, SingleInstance &instance,
                    const QString &splashPath)
 {
   log::info(
-    "starting Mod Organizer version {} revision {} in {}",
-    getVersionDisplayString(), GITID, QCoreApplication::applicationDirPath());
+    "starting Mod Organizer version {} revision {} in {}, usvfs: {}",
+    getVersionDisplayString(), GITID, QCoreApplication::applicationDirPath(),
+    MOShared::getUsvfsVersionString());
 
   preloadSsl();
   if (!QSslSocket::supportsSsl()) {
diff --git a/src/shared/util.cpp b/src/shared/util.cpp
index 58f4eb2b..32eb825c 100644
--- a/src/shared/util.cpp
+++ b/src/shared/util.cpp
@@ -20,6 +20,8 @@ along with Mod Organizer.  If not, see <http://www.gnu.org/licenses/>.
 #include "util.h"
 #include "windows_error.h"
 #include "mainwindow.h"
+#include <usvfs.h>
+#include <usvfs_version.h>
 
 namespace MOShared
 {
@@ -244,6 +246,50 @@ MOBase::VersionInfo createVersionInfo()
   }
 }
 
+QString getUsvfsDLLVersion()
+{
+  // once 2.2.2 is released, this can be changed to call USVFSVersionString()
+  // directly; until then, using GetProcAddress() allows for mixing up devbuilds
+  // and usvfs dlls
+
+  using USVFSVersionStringType = const char* WINAPI ();
+
+  QString s;
+
+  const auto m = ::LoadLibraryW(L"usvfs_x64.dll");
+
+  if (m) {
+    auto* f = reinterpret_cast<USVFSVersionStringType*>(
+      ::GetProcAddress(m, "USVFSVersionString"));
+
+    if (f) {
+      s = f();
+    }
+
+    ::FreeLibrary(m);
+  }
+
+  if (s.isEmpty()) {
+    s = "?";
+  }
+
+  return s;
+}
+
+QString getUsvfsVersionString()
+{
+  const QString dll = getUsvfsDLLVersion();
+  const QString header = USVFS_VERSION_STRING;
+
+  QString usvfsVersion;
+
+  if (dll == header) {
+    return dll;
+  } else {
+    return "dll is " + dll + ", compiled against " + header;
+  }
+}
+
 } // namespace MOShared
 
 
diff --git a/src/shared/util.h b/src/shared/util.h
index aea6f200..e87244b6 100644
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -45,6 +45,7 @@ std::wstring ToLower(const std::wstring &text);
 bool CaseInsensitiveEqual(const std::wstring &lhs, const std::wstring &rhs);
 
 MOBase::VersionInfo createVersionInfo();
+QString getUsvfsVersionString();
 
 } // namespace MOShared