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OllyDBG is a free disassembler.
Download: The Bytecode Club tools page
How to use
Start OllyDbg and press F3 to open a compatible executable. Select an instruction and press F2 to toggle a breakpoint. F9 runs the program; F7 steps into a call and F8 steps over it. Watch the registers, stack and disassembly as execution stops.
Based on the official quick start, which documents version 1.10; consult the bundled help for your version.
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