Hitomaro!
I liked the original Operation Flashpoint music too so if you like it i will explain how to get it back. Backup everything you will replace because something can go wrong .
First go to your Opf directory and go to DTA folder. Find the music.pbo copy it and paste in your ffur dta ffolder(backup the furr music.pbo because it can go wrong).This one will only get the Operation Flashpoint music back no the resistance one. I have made my own soundtrack for the resistance tracks if you want it i could send it to you! Â