M7 file extension is for Sound Farallon's MacRecorder format sampling rate 7k
Similar to M7
8BF - Adobe Illustrator Filter8CM - 8 Channel Module Music
8M - Math 8 extended character set printer font PageMaker
8MED - Amiga OctaMed Music file
8SVX - Amiga 8-bit Sound format
8U - Roman 8 extended character set printer font PageMaker
91 - 91x91 dpi display font Ventura Publisher
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