diff --git a/src/tint2conf/CMakeLists.txt b/src/tint2conf/CMakeLists.txt
index 12d1494..530ddf1 100644
--- a/src/tint2conf/CMakeLists.txt
+++ b/src/tint2conf/CMakeLists.txt
@@ -71,3 +71,4 @@ add_subdirectory(po)
 install( TARGETS tint2conf DESTINATION bin )
 install( FILES tint2conf.svg DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/scalable/apps )
 install( FILES tint2conf.desktop DESTINATION ${CMAKE_INSTALL_DATADIR}/applications )
+install( FILES tint2conf.xml DESTINATION ${CMAKE_INSTALL_DATADIR}/mime/packages )
diff --git a/src/tint2conf/main.c b/src/tint2conf/main.c
index 90a8b27..3bc7f32 100644
--- a/src/tint2conf/main.c
+++ b/src/tint2conf/main.c
@@ -74,7 +74,7 @@ gboolean endswith(const char *str, const char *suffix)
 // Returns TRUE if the theme file is in ~/.config.
 gboolean theme_is_editable(const char *filepath)
 {
-    return startswith(filepath, g_get_user_config_dir());
+    return access(filepath, W_OK) == 0;
 }
 
 // Returns TRUE if the theme file is ~/.config/tint2/tint2rc.
diff --git a/src/tint2conf/tint2conf.desktop b/src/tint2conf/tint2conf.desktop
index ca4bc18..e92a33f 100644
--- a/src/tint2conf/tint2conf.desktop
+++ b/src/tint2conf/tint2conf.desktop
@@ -113,3 +113,4 @@ Exec=tint2conf
 Icon=tint2conf
 Terminal=false
 Categories=Settings;DesktopSettings;
+MimeType=application/x-tint2-theme
diff --git a/src/tint2conf/tint2conf.xml b/src/tint2conf/tint2conf.xml
new file mode 100644
index 0000000..c5d3e6c
--- /dev/null
+++ b/src/tint2conf/tint2conf.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
+  <mime-type type="application/x-tint2-theme">
+    <comment xml:lang="en">tint2 theme file</comment>
+      <sub-class-of type="text/plain"/>
+      <glob pattern="*tint2rc"/>
+  </mime-type>
+</mime-info>