While searching for windows.txt via Bit.ly links is a common method for finding Windows keys, it is fraught with security dangers and legal issues.
This guide explains what the windows.txt phenomenon is, how the file-sharing process works via services like Bit.ly, and the security risks involved. windows.txt bit.ly
Here is a short story inspired by the "mythology" of this specific internet shortcut: The Ghost in the Script While searching for windows