.TMC File Extension
File TypeTheta Music Composer 1.x Audio File
What is a TMC file?
Audio file created by Theta Music Composer (TMC), a music editor for Atari; supports mono and stereo audio; allows users to experiment with stereo Atari music; differs from the similar .TM8 format, which supports 8 channels.
TMC files can be played with ASAP - Another Slight Atari Player.