Is there any way to replace DF's music with another set of music files and have the game play those instead? SR1_04_Ruined_city would sound great in a dungeon.

i only know how to do it if you have the game and all files on a CD or DVD

I have the version that was downloadable from the The Elder scrolls website before it went all skyrimy. Though I would like to hear what your CD/DVD method is anyway.