Posted 08 January 2012 - 05:04 PM
Open Nautilus, go to where one of the files is, right-click it, choose Properties, click on Open With, and choose a different default.
You can also go through ~/.local/share/mime (a directory of files) to see which one in there handled the filetype, then change or delete it. Just be careful with the syntax if you alter one. It's plain text xml, but you need to make sure all opening/closing statements are done properly. You could also move it temporarily to your home directory to test things before committing to deletion. (Either action may require a logout/in to take effect.)