| Do some google searches. Lots of info on all these out there, and most of them have free editors/compressors/etc.|
mod, s3m, xm, and it are all trackers of various sorts. Mods have nothing to do with MIDI, they are arranged sampled sounds. Mod is limited to 4 voices, but the others are more flexible.
Ogg and asf are music streams. Ogg refers to "Ogg Vorbis", my personal favorite, an MP3-like compressed stream developed by open source people (so you don't have to license the playback routines like you do MP3). Asf is MicroSoft's answer to MP3, with "rights management" (gak).
Not sure what raw is.. I assume it's just raw sample data.