A3 file extension is for Unrelated Inventions Audiotools Show Log
Similar to A3
12M - Lotus123 Smartmaster file15U - Printer font with PI font set PageMaker
1ST - Usually README.1ST text
24B - 24bit data Bitmap graphics
286 - Virtual device driver Windows standard mode
2GR - VGA graphics driver Windows Video grabber
301 - Fax Super FAX 2000 - Fax-Mail 96
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