COPYPART.PET/COPYPART.COM (copypart.lp/copypart.txt)

COPYPART copy part of a file to COPYPART.DAT. Currently more
than 2GB file is not supported.

copypart <filename> <offset>. [<length>.]
where
offset and length are positive double integer numbers,
starting from 0. Unspecified length means all remaining data.
The dot after <offset> and <length> is mandatory to inform the
program that it is a double integer number.

This program can be used to
-    get part of a file
     copypart disk1.flp 13.
     copypart.dat contains disk1.flp except the first 13 bytes
-    split a file to smaller files to be recombined again
     copypart file.big 0. 1000000.
     rename copypart.dat file.001
     copypart file.big 1000000. 1000000.
     rename copypart.dat file.002
     copypart file.big 2000000.
     rename copypart.dat file.003
     later,
     copy /b file.001+file.002+file.003 file.big
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