The My Documents/Documents path is not unorthodox for games to save files. many games in the past used this user dependend path to store the data.
This way you wouldn't loose your save games and addon stuff if you reinstall the game and the c:\program files\... path gets deleted too.
But in my eyes it shouldn't just use the c:\ (or system harddrive) to scan for the addons but use the real documents path that someone specified in the windows (OS) settings.
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