It's not actually a filter string, it's where you can enter a command for a program not in the list--see the descriptive text above. I agree that the position is somewhat confusing, though.
** Changed in: ubuntu Status: New => Invalid -- kde systemsettings file association application filter does not work https://bugs.launchpad.net/bugs/365612 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs