Engadget
How Enterprising Modders Installed Windows NT On Nintendo GameCubes

Modders converted a PowerPC-compiled Windows NT 4.0 build to run on Nintendo GameCubes by swapping the disc drive for a custom mod drive and adding an SD card through a GameCube memory-card adapter. Demonstrations by emu_kidid, Jiga Tech, and Michael MJD show the system booting, playing Solitaire, recognizing the ASCII GameCube keyboard, and partially supporting the DK Bongo controller, proving a 1990s PowerPC OS can operate on legacy console hardware.