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by rootw0rm 1369 days ago
You use your favorite reversing tools. IDA, Ghidra, x64dbg, binary ninja, etc.

For this particular example, Photoshop, an error message is displayed for currency detection. The first thing I would do is load up the executable and look for that particular string. If I'm lucky and there aren't many protections for the executable, I'll be in the right area for figuring out what to patch, or I'll at least know which code paths to start tracing.