Hi!

Why not use the fc.exe DOS command and put output to the text file, than use that text file to get differences?

RUN fc /B D:\Uninstall.exe E:\Uninstall.exe >comp.txt

Comp.txt now contains the differences list. Explore its format and take the advantage of that tool.

>I have the need to check all difference from 2 files (binary).
>I want to create a difference file, that I can use to pathc the original file.
>This is the idea! Any suggestion ? My code, a lot of loop with substring find, is slow (very slow)! Any suggestion/idea to improve performance?
>
>Enrico De Angelis