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PeDiffEr is advanced GUI for pediff.dll - free PE module binary comparator. With this utility you can compare two PE-module files (exe,dll,...). Pediff.dll uses levenshtein distance algorithm to find identical and/or similar functions in two binaries. Software is freeware and portable. No need to install anything. There's an option to import .map file for first binary and remap it correctly to second module. External text differ application can be easily integrated. Archive includes c++ source code, class which allows you to write your own PE-differ.