I am an avid fan of the movie Hunt for Red October and I managed to find the theme for it on youtube
(here)
 
Once I downloaded the flv file I ripped the music for it, renamed it to Battle.cxf and moved to to the NF sounds folder.

Then, when I tried to run NF, the thing crashes(ram usage stays at ~ 69mb, black screen, Ctrl Alt Del works).

My question is what is the maximum file size for the in-game music? The mp3 file came out  to around 11 megs and it's REALLY great music