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When application is not listed in preferred applications in MATE

Ivan Radovanovic's picture

Reason for this is application .desktop file missing MimeType specification. For example for me mplayer and thunderbird are not listed as choices for video and mail respectively. To fix this edit application's .desktop file (in /usr/local/share/applications directory, or in ~/.local/share/applications) and run update-desktop-database afterwards (with -v to show its warnings).

For thunderbird I used
MimeType=x-scheme-handler/mailto
and for mplayer
MimeType=video/x-msvideo;video/mpeg;video/x-matroska;video/mp2t;video/ogg;video/webm;video/mp4