diff --git a/.gitattributes b/.gitattributes
index af0322240..67a86deae 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,5 +1,5 @@
 # libtransmission
-libtransmission/mime-types.h linguist-generated=true
+lib/base/mime-types.h linguist-generated=true
 
 # web
 web/package.json.buildonly linguist-generated=true
diff --git a/gtk/FileList.cc b/gtk/FileList.cc
index 1201d3408..305eeddf2 100644
--- a/gtk/FileList.cc
+++ b/gtk/FileList.cc
@@ -12,10 +12,8 @@
 #include "Session.h"
 #include "Utils.h"
 
-#include <libtransmission/utils.h>
-
-#include "lib/base/string-utils.h"
 #include <lib/base/file-utils.h>
+#include <lib/base/string-utils.h>
 
 #include <giomm/icon.h>
 #include <glibmm/fileutils.h>
diff --git a/gtk/Torrent.cc b/gtk/Torrent.cc
index 0236aeedd..003cdc0c0 100644
--- a/gtk/Torrent.cc
+++ b/gtk/Torrent.cc
@@ -13,6 +13,7 @@
 #include <libtransmission/transmission.h>
 #include <libtransmission/utils.h>
 
+#include "lib/base/file-utils.h"
 #include "lib/base/tr-macros.h"
 #include "lib/base/values.h"
 
diff --git a/lib/base/CMakeLists.txt b/lib/base/CMakeLists.txt
index e044bab42..59d1a8d3c 100644
--- a/lib/base/CMakeLists.txt
+++ b/lib/base/CMakeLists.txt
@@ -21,6 +21,7 @@ target_sources(trbase
         i18n.h
         log.cc
         log.h
+        mime-types.h
         quark.cc
         quark.h
         serializer.cc
diff --git a/lib/base/file-utils.cc b/lib/base/file-utils.cc
index fc3af78c3..20f9ec4cd 100644
--- a/lib/base/file-utils.cc
+++ b/lib/base/file-utils.cc
@@ -6,6 +6,9 @@
 #include <string_view>
 #include <vector>
 
+#include <algorithm>
+#include <iterator>
+
 #ifndef _WIN32
 #include <sys/stat.h> /* umask() */
 #endif
@@ -18,6 +21,8 @@
 #include "lib/base/file.h"
 #include "lib/base/i18n.h"
 #include "lib/base/log.h"
+#include "lib/base/mime-types.h"
+#include "lib/base/string-utils.h"
 #include "lib/base/tr-strbuf.h"
 
 using namespace std::literals;
@@ -197,3 +202,40 @@ bool tr_file_move(std::string_view oldpath, std::string_view newpath, bool allow
 
     return true;
 }
+
+// --- mime-type
+
+std::string_view tr_get_mime_type_for_filename(std::string_view filename)
+{
+    auto constexpr Compare = [](mime_type_suffix const& entry, auto const& suffix)
+    {
+        return entry.suffix < suffix;
+    };
+
+    if (auto const pos = filename.rfind('.'); pos != std::string_view::npos)
+    {
+        auto const suffix_lc = tr_strlower(filename.substr(pos + 1));
+        auto const it = std::lower_bound(std::begin(MimeTypeSuffixes), std::end(MimeTypeSuffixes), suffix_lc, Compare);
+        if (it != std::end(MimeTypeSuffixes) && suffix_lc == it->suffix)
+        {
+            std::string_view mime_type = it->mime_type;
+
+            // https://github.com/transmission/transmission/issues/5965#issuecomment-1704421231
+            // An mp4 file's correct mime-type depends on the codecs used in the file,
+            // which we have no way of inspecting and which might not be downloaded yet.
+            // Let's use `video/mp4` since that's by far the most common use case for torrents.
+            if (mime_type == "application/mp4")
+            {
+                mime_type = "video/mp4";
+            }
+
+            return mime_type;
+        }
+    }
+
+    // https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
+    // application/octet-stream is the default value.
+    // An unknown file type should use this type.
+    auto constexpr Fallback = "application/octet-stream"sv;
+    return Fallback;
+}
diff --git a/lib/base/file-utils.h b/lib/base/file-utils.h
index f39c31ef8..03d7f0319 100644
--- a/lib/base/file-utils.h
+++ b/lib/base/file-utils.h
@@ -18,6 +18,8 @@ struct tr_error;
 
 bool tr_file_read(std::string_view filename, std::vector<char>& contents, tr_error* error = nullptr);
 
+[[nodiscard]] std::string_view tr_get_mime_type_for_filename(std::string_view filename);
+
 /**
  * Tries to move a file by renaming, and [optionally] if that fails, by copying.
  *
diff --git a/libtransmission/mime-types.h b/lib/base/mime-types.h
similarity index 99%
rename from libtransmission/mime-types.h
rename to lib/base/mime-types.h
index 4200c6bb1..cde357ea7 100644
--- a/libtransmission/mime-types.h
+++ b/lib/base/mime-types.h
@@ -1,4 +1,4 @@
-// This file was generated with libtransmission/mime-types.js
+// This file was generated with lib/base/mime-types.js
 // DO NOT EDIT MANUALLY
 
 // This file Copyright © Mnemosyne LLC.
diff --git a/libtransmission/mime-types.js b/lib/base/mime-types.js
similarity index 97%
rename from libtransmission/mime-types.js
rename to lib/base/mime-types.js
index 50bf619b5..88d5e3edd 100755
--- a/libtransmission/mime-types.js
+++ b/lib/base/mime-types.js
@@ -2,7 +2,7 @@
 import fs from 'node:fs';
 
 const copyright =
-  `// This file was generated with libtransmission/mime-types.js
+  `// This file was generated with lib/base/mime-types.js
 // DO NOT EDIT MANUALLY
 
 // This file Copyright © Mnemosyne LLC.
diff --git a/libtransmission/CMakeLists.txt b/libtransmission/CMakeLists.txt
index 087f0f8ec..9f225e82f 100644
--- a/libtransmission/CMakeLists.txt
+++ b/libtransmission/CMakeLists.txt
@@ -62,7 +62,6 @@ target_sources(${TR_NAME}
         magnet-metainfo.h
         makemeta.cc
         makemeta.h
-        mime-types.h
         net.cc
         net.h
         open-files.cc
diff --git a/libtransmission/torrent-files.cc b/libtransmission/torrent-files.cc
index 262f08d67..1248d7215 100644
--- a/libtransmission/torrent-files.cc
+++ b/libtransmission/torrent-files.cc
@@ -30,7 +30,6 @@
 
 #include "libtransmission/torrent-files.h"
 #include "libtransmission/types.h"
-#include "libtransmission/utils.h"
 
 using namespace std::literals;
 
diff --git a/libtransmission/utils.cc b/libtransmission/utils.cc
index 4fd98e045..71d6034ba 100644
--- a/libtransmission/utils.cc
+++ b/libtransmission/utils.cc
@@ -44,7 +44,6 @@
 #include "lib/base/tr-strbuf.h"
 #include "lib/base/values.h"
 
-#include "libtransmission/mime-types.h"
 #include "libtransmission/types.h"
 #include "libtransmission/utils.h"
 
@@ -435,40 +434,3 @@ void tr_lib_init()
             tr::serializer::install_libtransmission_converters();
         });
 }
-
-// --- mime-type
-
-std::string_view tr_get_mime_type_for_filename(std::string_view filename)
-{
-    auto constexpr Compare = [](mime_type_suffix const& entry, auto const& suffix)
-    {
-        return entry.suffix < suffix;
-    };
-
-    if (auto const pos = filename.rfind('.'); pos != std::string_view::npos)
-    {
-        auto const suffix_lc = tr_strlower(filename.substr(pos + 1));
-        auto const it = std::lower_bound(std::begin(MimeTypeSuffixes), std::end(MimeTypeSuffixes), suffix_lc, Compare);
-        if (it != std::end(MimeTypeSuffixes) && suffix_lc == it->suffix)
-        {
-            std::string_view mime_type = it->mime_type;
-
-            // https://github.com/transmission/transmission/issues/5965#issuecomment-1704421231
-            // An mp4 file's correct mime-type depends on the codecs used in the file,
-            // which we have no way of inspecting and which might not be downloaded yet.
-            // Let's use `video/mp4` since that's by far the most common use case for torrents.
-            if (mime_type == "application/mp4")
-            {
-                mime_type = "video/mp4";
-            }
-
-            return mime_type;
-        }
-    }
-
-    // https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
-    // application/octet-stream is the default value.
-    // An unknown file type should use this type.
-    auto constexpr Fallback = "application/octet-stream"sv;
-    return Fallback;
-}
diff --git a/libtransmission/utils.h b/libtransmission/utils.h
index 4f0a1da54..8a85fd2fa 100644
--- a/libtransmission/utils.h
+++ b/libtransmission/utils.h
@@ -25,8 +25,6 @@ std::optional<std::locale> tr_locale_set_global(std::locale const& locale) noexc
 
 // ---
 
-[[nodiscard]] std::string_view tr_get_mime_type_for_filename(std::string_view filename);
-
 /** @brief return the current date in milliseconds */
 [[nodiscard]] uint64_t tr_time_msec();
 
diff --git a/tests/libtransmission/utils-test.cc b/tests/libtransmission/utils-test.cc
index fee030b63..7ebf4ae88 100644
--- a/tests/libtransmission/utils-test.cc
+++ b/tests/libtransmission/utils-test.cc
@@ -17,6 +17,7 @@
 #include <gtest/gtest.h>
 
 #include "lib/base/env.h"
+#include "lib/base/file-utils.h"
 
 #include "libtransmission/transmission.h"
 #include "libtransmission/utils.h"