File extensions association

After clicking the button "Set up associations..." i'll get this error:

📎 Unparseable attachment reference

VLC Version 2.1.5 Rincewind Testet also with the nightly build vlc-3.0.0-git-20141219-0403-win64

Same Problem.

What i´ve already done:

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information