What file types do we don't support that you would like us to add?

Making an official thread to keep on top of this better. Most of these are relatively easy to add.

I'm not quite sure why LynxChan has a filter on these. It maybe easy to start a list of what we don't want.

IF YOU ARE HAVING PROBLEMS, TEST HERE AND LET USE KNOW THE MIME TYPE YOU GET:
http://mime.ritey.com

Here's the current list:
application/download,
application/epub+zip,
application/gzip,
application/pdf,
application/vnd.adobe.flash.movie,
application/x-7z-compressed
application/x-7z-compressed,