http://github.com/christophgysin/pasystray/issues/3

--- data/pasystray.desktop
+++ data/pasystray.desktop
@@ -1,6 +1,5 @@
 [Desktop Entry]
 Version=1.0
-Encoding=UTF-8
 Name=PulseAudio System Tray
 GenericName=
 Comment=An Applet for PulseAudio
@@ -8,4 +7,4 @@
 Icon=pasystray
 StartupNotify=true
 Type=Application
-Categories=Application;AudioVideo;Audio;
+Categories=AudioVideo;Audio;