Date: Tue, 7 Nov 2000 13:25:54 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: djgpp AT delorie DOT com
Subject: Re: Partial file overwrite
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On Tue, 7 Nov 2000 stryyker AT my-deja DOT com wrote:

> how do I overwrite a part of a binary file without disturbing the rest?

Open the file in read/write mode, seek to the place where you want to 
change, write the new contents, then close the file.

Does that do what you want?