Cannot open files with unsupported MIME types on Android

[umbopepato]

Cached files with a valid extension but an unrecognized MIME type (i.e. test.zip, application/x-zip-compressed) cannot be opened on Android.

Possible solutions

• Try to open the file in the browser (not currently possible because of authn)
• Let the user open the file manually (this implies changing the cache location so that it's visible in file explorers)