Since Grenideer's copyrighted his game, I figure I probably can't just give you the files. But I can tell you how to do this yourself!
First, get this unpacker tool: http://verge-rpg.com/files/detail.php?id=736
Make a folder named "music" in the base folder where you have Diver Down. It's important you do this before using unpack because unpack doesn't create folders for you. Then drag the file named "x.vrg" over the unpack executable.
After that, you should have a music folder filled with all the songs that Diver Down uses. You can play mod, xm, and s3m with Winamp just fine.
If for some reason you really need to convert these files,
go download Modplug.
Open those music files with Modplug and go to "File >> Save As MP3" for each of them.