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DOS uses a filesystem which supports 9.3 filenames: 9 characters for the filename and 3 characters for the extension.
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xvminitoppm(1) [redhat man page]

xvminitoppm(1)						      General Commands Manual						    xvminitoppm(1)

NAME
xvminitoppm - convert a XV "thumbnail" picture to PPM SYNOPSIS
xvminitoppm [xvminipic] DESCRIPTION
Reads a XV "thumbnail" picture (a miniature picture generated by the "VisualSchnauzer" browser) as input. Produces a portable pixmap as output. SEE ALSO
ppm(5), xv(1) AUTHOR
Copyright (C) 1993 by Ingo Wilken 14 December 1993 xvminitoppm(1)

Check Out this Related Man Page

ppmtopict(1)                                                  General Commands Manual                                                 ppmtopict(1)

NAME
ppmtopict - convert a portable pixmap into a Macintosh PICT file SYNOPSIS
ppmtopict [ppmfile] DESCRIPTION
Reads a portable pixmap as input. Produces a Macintosh PICT file as output. The generated file is only the data fork of a picture. You will need a program such as mcvert to generate a Macbinary or a BinHex file that contains the necessary information to identify the file as a PICT file to MacOS. Even though PICT supports 2 and 4 bits per pixel, ppmtopict always generates an 8 bits per pixel file. BUGS
The picture size field is only correct if the output is to a file since writing into this field requires seeking backwards on a file. How- ever the PICT documentation seems to suggest that this field is not critical anyway since it is only the lower 16 bits of the picture size. SEE ALSO
picttoppm(1), ppm(5), mcvert(1) AUTHOR
Copyright (C) 1990 by Ken Yap <ken@cs.rocester.edu>. 15 April 1990 ppmtopict(1)

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