FileInfo.com - The File Extensions Resource

.VAG File Extension

File Type	PlayStation Compressed Sound File
File Format	File
Common?	No
File Description	4-bit compressed sound format used by PlayStation and PlayStation Portable games; compressed using ADPCM (Adaptive Differential Pulse Code Modulation) encoding.
Program(s) that open vag files	Windows: MFAudio; Nullsoft Winamp with in_cube plugin

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/vag