Originally Posted by majikthise
The files in question are pure binary, and now that I've removed the extensions manually that's what Fedora thinks they are. I got the files via FTP (Firefox 3 beta 5) do you think this might be the cause?
No, I would rather suspect some glitch in mime-type recognition and/or firefox/brasero interface with mime-type data, but that is of course just an educated guess. Anything's possible IMO with beta software, only important thing is it's perfectly clear now that this is an error, not a surprise new feature.