By default, Windows looks for an official Microsoft server or a validated corporate server to authenticate keys. The script runs a command ( slmgr /skms ) to point your computer away from Microsoft and toward a third-party, unauthorized KMS server hosted on the internet.
Wait, the user might have meant "windowstxt" as two words: "windows txt" (Microsoft Windows text file), but that's unclear. It could be a username. Alternatively, maybe the protagonist works with Windows and text files as part of their job. The 10 kilometers could be a physical distance they need to cover.
The setting could be a small town where the 10 KM is a local event. The link might be part of a puzzle created by a friend or a corporation as a test. The story could involve solving clues, leading to a physical location. Maybe the windows.txt refers to text files hidden in the system or online. The protagonist could face challenges using their tech and running skills.