TheoryMedia is a multimedia player, media library, and mobile device management application developed by Theorysonic that is used for playing, downloading and watching audio, video and viewing images on personal computers running the TSUG, Windows, Mac OS, EKS Vortex, Android, iOS, ViraOS and Portosic devices.
The application was launched in 1981 with only playable media format: .TME (mixed audio and video). Since 1986, it adds .TMA audio, .TVD, and .TMD video format. TheoryMedia 8 adds MP4 and MP3 support.
TheoryMedia X adds VCD and Portosic digital devices support, X2 adds DVD support.