A00 file extension is for Archive Section of a file distributed by archives
Similar to A00
123 - Lotus123 Data file12M - Lotus123 Smartmaster file
15U - 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
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