window: add application/x-zerosize to open dialog
As follow up for commit 5e002c5a, that added the application/x-zerosize mimetype to the desktop file in, this adds that mimetype also to the filter in the the file open dialog.
Fixes #486 (closed).
As follow up for commit 5e002c5a, that added the application/x-zerosize mimetype to the desktop file in, this adds that mimetype also to the filter in the the file open dialog.
Fixes #486 (closed).