There are 2 file types use the .TM2 file extension:
1. PlayStation 2 Graphic
Image file used by some games for the Sony PlayStation 2 console system; saved on the game disc and often used for storing textures; can be viewed with the free XnView program.
Updated: January 2, 2013
2. Theta Music Composer 2.x Audio File
Audio file created by Theta Music Composer 2.x (TMC 2), a program used for editing multi-channel, stereo Atari music; can be played with ASAP - Another Slight Atari Player.
Updated: December 11, 2012