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There is working fix for level 12 issue. Just google for "halo 2 loaderplus" and use Loaderplus instead of Loader to launch the game.
The problem is in ReadFile API function. The version included in XP cannot read file chunks bigger than 64 MB, and the Vista one can, so this new Loader intercepts ReadFile calls which try to read more than 64 MB in one try and split them into the multiple calls.
Hope this helps.
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