Use "Super Search" or the Google alternative. Searching on "compiled source exe" I found articles:
perl2exe - no more secrets
Security, is it to much to ask?
A real challenge
That's just what I found easily. I'm sure searching with other words would find the answer you need. Maybe 'decompile'?
Apparently a key question is: What compiled your code into an .exe and when? (that is, what version of that tool?)
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