15U file extension is for Printer font with PI font set PageMaker

Similar to 15U

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
3D2 - Atari Stereo CAD-3D 3D data file
3DM - QuickDraw 3D Metafile QuickDraw

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