This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
You can do it 'by hand' using a block editor to change filetype, etc.
information in a directory block; or, you can use UnforkIt. UnforkIt is a BASIC
program by Ivan Drucker which splits a forked file into two files, neither of
which is forked.
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Size Note: Transferring to 3.5" disk
Although 2MG, Diskcopy, and some other 800k image formats have file sizes
greater than 800k, on a ProDOS diskette they will often occupy a good deal less
space. You will often be able to transfer such files (e.g. via a NULL modem
connection) to an Apple II 800k diskette so long as you employ a protocol which
does not pre-send size information, such as X-modem.
 
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