Not all mimetypes are detected. Files without extensions and things like slack-desc
have no default assosiations.
Anyone know fix? Besides just manually doing this in the settings after installing. 

TDM isn't working right at the moment. At least installed outside of /usr.
Will look in to this when I have more free time. My apologies.

THE BUG REPORTS FOR EVERYTHING IF YOU'RE INTERESTED
https://bugs.trinitydesktop.org/buglist.cgi?quicksearch=ALL