Code: Select all
assoc .ftl=CompressedFolder
If you're using Vista or later, you'll need to do that from a command prompt with admin privileges. To get one of those, open up your start menu, type cmd in the search box, and press control+shift+enter (some kind of "are you sure?" window should pop up).
Sources:
http://superuser.com/questions/121540/c ... rd-party-t
http://www.sevenforums.com/tutorials/11 ... rator.html