Comment 8 for bug 1354391

I think this is the same issue so I'll add it here. Please let me know if I should file a separate bug:

Avi does not work at all because the browser asks which app to open with, but only suggests the Gallery app. It then downloads the .avi to .cache/com.ubuntu.gallery/HubIncoming/4/
The Gallery app doesn't show the movie afterwards so it is inaccessible and difficult to delete unless you know how to use the terminal.