Attachments want to open with KeePassDX for all file extensions

When i click on an attachment in GMAIL with my own file extension (which is *.irplus) it suggests to open with KeePassDX (in addition to my app). This is not a serious thing, but probably the intent for detecting keepass files is too greedy ;)

Start by reproducing the attachment-opening behavior from Gmail with a non-KeePass extension such as .irplus. Trace how the Android app declares or handles file types and compare that behavior with supported KeePass formats. Done means unrelated attachment extensions no longer suggest KeePassDX while supported files still open normally.

Written by the indexing model from the issue text.