PNM file extension is for Bitmap graphics PBM Portable aNyMap
Similar to PNM
4MD - Musical file4SW - 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
75 - Ventura Publisher 75x75 dots per inch display font file
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