CMU file extension is for Bitmap graphics
Carnegie Mellon University CMU Window Manager bitmap Formats
Similar to CMU
#SC - LocoScript Printer data file
#ST - LocoScript Standard mode printer definition file
$$P - OS/2 Notes file
$$S - OS/2 Spreadsheet
$00 - DOS Pipe file
$1 - ZX Spectrum file in HOBETA format
$D$ - Data
OS/2 Planner
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