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I need a program to edit exe files. For example to rewrite .text section in assembly or edit data .section. Do you know anything free suitable for me ?

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While IDA Pro is by fast the best, as Michael recommends, it's not free. Try something like Ollydbg instead.

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Good point. I upvoted you. – Michael Pryor Apr 9 '10 at 19:25

Never heard of PECOFF files, but I'm guessing since they're exe files you'll need a hex editor. I use bvi for hex editing, but it helps to know vi editing commands to use it.

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I need something which would change it into assembly – oneat Apr 9 '10 at 11:33

You need to search for a "windows disassembler".

IDA Pro is one of them.

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IDA pro isn't free, which is what the question asked for. – Dentrasi Apr 9 '10 at 15:23

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