Paper Mario: The Thousand-Year Door was originally released exclusively for the Nintendo GameCube in 2004. It has never been officially ported to Windows or any PC operating system, including Windows 7. There is no legitimate “download for Windows 7” from Nintendo.
I understand you're looking for Paper Mario: The Thousand-Year Door on Windows 7, but it’s important to clarify a few points to give you a helpful and honest review of your options.
The only way to play this game on Windows 7 is through emulation — using a program like Dolphin Emulator (GameCube/Wii emulator) to run the game’s disc image (an ISO or ROM file).
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