--- denemo.orig/pixmaps/denemo.desktop
+++ denemo/pixmaps/denemo.desktop
@@ -1,11 +1,12 @@
 [Desktop Entry]
-Exec=denemo
+Exec=denemo %F
 Icon=denemo
 StartupNotify=true
 Terminal=false
 Type=Application
 Categories=GNOME;Audio;AudioVideo;Music;Education;
-Keywords=music;notation;compose;transcribe;Education;
+MimeType=audio/midi;application/denemo;
+Keywords=music;notation;compose;transcribe;education;
 
 Name=GNU Denemo
 Name[de]=GNU Denemo
