[Bug 28621] cannot associate file type with open command

[gratefulfrog]

Public bug report changed:
https://launchpad.net/malone/bugs/28621

Comment:
Yes, there is an entry created. But the open command still fails. I
tried it for emacs. This is the content of
~/.local/share/applications/emacs21-usercustom-3.desktop

[Desktop Entry]
Version=1.0
Encoding=UTF-8
Name=Emacs 21 (X11)
GenericName=Emacs
Comment=GNU Emacs 21 Text Editor
Exec=/usr/bin/emacs21
TryExec=emacs21
Terminal=false
Type=Application
Icon=/usr/share/emacs/21.4/etc/gnu-32x32.xpm
Categories=Application;Utility;TextEditor;
MimeType=application/x-lyx;
NoDisplay=true