Winamp Description. Winamp plays MPEG Layer 2 (MP2) and Layer 3 (MP3) audio streams and combines extensive functionality with an intuitive interface. Winamp has a full-featured pl. Jun 17, · Nullsoft Winamp 5 is a fast, flexible, high-fidelity music player for Windows. Winamp supports playback of many audio (MP3, OGG, AAC, WAV, MOD, XM, S3M, IT, MIDI, etc) and video types (AVI,ASF.