This is not a XFCE related bug, but rather MIME or local settings. Try to create file "~/.local/share/applications/defaults.list" which contains [Default Applications] application/pdf=evince.desktop or add that line if file/section exists.
I guess you wish to have evince as an opener for pdf. I think that bug should be closed. -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
