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diff --git a/libs/archive/src/formatter.h b/libs/archive/src/formatter.h
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+/*
+Mod Organizer archive handling
+
+Copyright (C) 2020 MO2 Team. All rights reserved.
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 3 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef ARCHIVE_FORMAT_H
+#define ARCHIVE_FORMAT_H
+
+// This header specialize formatter() for some useful types. It should not be
+// exposed outside of the library. It also contains some useful methods for
+// string manipulation.
+
+#include <format>
+
+#include <cwctype>
+#include <filesystem>
+#include <stdexcept>
+#include <string>
+
+template <>
+struct std::formatter<std::string, wchar_t> : std::formatter<std::wstring, wchar_t>
+{
+  template <typename FormatContext>
+  auto format(std::string const& s, FormatContext& ctx) const
+  {
+    return std::formatter<std::wstring, wchar_t>::format(
+        std::wstring(s.begin(), s.end()), ctx);
+  }
+};
+
+template <>
+struct std::formatter<std::exception, wchar_t> : std::formatter<std::string, wchar_t>
+{
+  template <typename FormatContext>
+  auto format(std::exception const& ex, FormatContext& ctx) const
+  {
+    return std::formatter<std::string, wchar_t>::format(ex.what(), ctx);
+  }
+};
+
+template <>
+struct std::formatter<std::error_code, wchar_t> : std::formatter<std::string, wchar_t>
+{
+  template <typename FormatContext>
+  auto format(std::error_code const& ec, FormatContext& ctx) const
+  {
+    return std::formatter<std::string, wchar_t>::format(ec.message(), ctx);
+  }
+};
+
+template <>
+struct std::formatter<std::filesystem::path, wchar_t>
+    : std::formatter<std::wstring, wchar_t>
+{
+  template <typename FormatContext>
+  auto format(std::filesystem::path const& path, FormatContext& ctx) const
+  {
+    return std::formatter<std::wstring, wchar_t>::format(path.wstring(), ctx);
+  }
+};
+
+namespace ArchiveStrings
+{
+
+/**
+ * @brief Join the element of the given container using the given separator.
+ *
+ * @param c The container. Must be satisfy standard container requirements.
+ * @param sep The separator.
+ *
+ * @return a string containing the element joint, or an empty string if c
+ *     is empty.
+ */
+template <class C>
+std::wstring join(C const& c, std::wstring const& sep)
+{
+  auto begin = std::begin(c), end = std::end(c);
+
+  if (begin == end) {
+    return {};
+  }
+  std::wstring r = *begin++;
+  for (; begin != end; ++begin) {
+    r += *begin + sep;
+  }
+
+  return r;
+}
+
+/**
+ * @brief Conver the given string to lowercase.
+ *
+ * @param s The string to convert.
+ *
+ * @return the converted string.
+ */
+inline std::wstring towlower(std::wstring s)
+{
+  std::transform(std::begin(s), std::end(s), std::begin(s), [](wchar_t c) {
+    return static_cast<wchar_t>(::towlower(c));
+  });
+  return s;
+}
+}  // namespace ArchiveStrings
+
+#endif