"Extension Buddy" for Fedora 9?

[Mark]

Hey,

A few days ago i installed Audacious on my Fedora 8 and it works fine!
no issue with that. But now i wanted to open up a .m3u file extension
and fedora didn't know what to do with it.. so i had to select the
audio player for it manually (Audacious). And there are a lot more
extensions that fedora doesn't know of. .m3u is just an example.

Now because of this i'm wondering if it would be a good idea to have a
"Codec Budde" for the extensions (lets call it Extension Buddy) that
fixes extensions for files if the program than can play it is
installed or that it shows a list of possible applications that can
handle that extension (like Codec Buddy with the codecs) or that it
lets you select a default application for every single extension (that
last part is needed in linux).

So what do you think of it?
good idea? bad idea?

Thanx,
Mark.