Can the serial key of a retail version be checked by Run/regedit on Windows ?

[Petike]

Well, I've received word from the retailer. They're unable to help me with this. So, we'll search for it further.

OK, plutomaniac, I've prepared 4 screenshots of my Amnesia-related folders. I'll send them to you via PMs (if I can figure out how to add an attachment).

And yes, I still have the retail Amnesia installed on my desktop and, IIRC, I haven't uninstalled it since 2011, when I bought it and first installed it. So, the key could still probably be there.

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EDIT: Alright, I've sent you a PM. Hopefully, those four screenshots will be able to help. If you need more, just notify me. Thank you.