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@Wracta !
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I think the issue may be that you don't have the same version of TW3 on both systems. For example, if you purchased the base game and expansions separately on Xbox, then purchased the "Game of the Year" edition on PC, those will actually register as different products on the different platforms. (Since you're moving to PC, you may want to bring this up in the Modding boards, if that is the case, as there may be an unofficial way of getting them to work on PC.)