If you browse the reviews you will find a number of people claiming that The Settlers 3 doesn't work or even that it's a scam. Well after trying every solution proposed in the forum I give up. Running the cmd-file as admin? Nope, doesn't help, still wants a Serial Number. S3.EXE won't run at all, it's stuck idling using 4~5 MB of memory, only s3multi.exe starts up. No compat mode changes anyting. Just no. If I had just bought it, I would go for a refund, but I bought it too long in the past.