RG file extension is for 1bit B&W 4bit CMYK Raster Graphics format
Similar to RG
15U - Printer font with PI font set PageMaker1ST - 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
386 - Virtual device driver Windows 386 enhanced mode
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