Editing binary files

[Dotan Cohen]

Some binary files do contain plain text in them. In theory, is it
possible to edit this plain text in an editor such as VIM and then
expect the binary to run?

I am specifically asking about some convoluted file format that I
cannot upload an example of, but the user lost the original files to
make it yet the parts that he needs changed are visible as plaintext
when opening in VIM. Despite it not working and my insistence that it
shouldn't work, the user _insists_ that he has done this before.

What say you?

-- 
Dotan Cohen

http://gibberish.co.il
http://what-is-what.com