AD2 file extension is for ADPCM 2-bit compressed voice file ZFAX
Similar to AD2
4GL - Informix 4GL language source code file4MD - Musical file
4SW - 4DOS Swap file
4TH - Forth language source code file ForthCMP - LMI Forth
668 - Music the mixing is always at 12048Hz
669 - 669 Composer 8-channel MOD Music File
6CM - 6 Channel Module Music
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