Regarding the content of a "license key.txt" file for Far Cry 3, it would typically contain a series of characters that looks something like this:

The promise of a simple text file containing a valid license key is almost always a lure used by malicious actors. Modern digital rights management (DRM) systems, like those used by Ubisoft Connect and Steam , do not rely on static keys stored in plain text files found on third-party sites.

Attackers often exploit default Windows settings that hide file extensions. A file named license key.txt.exe will appear to you simply as license key.txt . If you double-click it thinking it is a text document, you will silently execute a program that infects your system.