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gogrepoc
Python-based tool for downloading all your GOG.com game and bonus collections to your local computer for full offline enjoyment.
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WorkOS
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If you're already familiar with other tools like gogrepoc, it'll likely take you no time at all to integrate these checks into your current workflow. Plus, it's far more reliable than trusting a filename, as you point out.
If you want to be absolutely certain of the version of the game you have, you should dump the game exe with something like innoextract and either read it's resource block or hash it against GoG, or Steam, or both for good measure.