Is ".mp2" a valid extension for Layer2 and why does KDE not support it?

[Dr. Juergen Pfennig]

Hi,
my DVB (digital video broadcast from Sat/Cable/Terr.) software creates MPEG 
Layer2 files for radio recordings. Layer2 is the original data format that is 
broadcasted. Unfortunately at some places in KDE ".mp2" is not fully 
supported (kfm in KDE 3.3 does not show meta-info for example). Some tools 
that can play Layer2 are not registered for the ".mp2" extension. Should I 
save the data as ".mp2" or as ".mp3"? Unfortunately in KDE 3.2 arts (noatune) 
gets confused by ".mp3" containing Layer2 data. Any ideas?

Jürgen