Here's the file types my Winamp 2.91 supports: (one added plugin: SNESamp)
CDA, MPG, MPEG, M2V, AVI, ASF, WMV, MID, MIDI, RMI, KAR, MIZ, MOD, MDZ, NST, STM, STZ, S3M, S3Z, IT, ITZ, XM, XMZ, MTM, ULT, 669, FAR, AMF, OKT, PTM, MP3, MP2, MP1, NSV, NSA, SPC, SP1, SP2, SP3, SP4, SP5, SP6, SP7, SP8, SP9, ZST, ZS1, ZS2, ZS3, ZS4, ZS5, ZS6, ZS7, ZS8, ZS9, OGG, WAV, VOC, AU, SND, AIF, AIFF, WMA, M3U, PLS.
There is a reason why Winamp 2 rocks.

Derby: Content clearance.