Sony's timed exclusive with Unreal Tournament 3 looks to have happened in part thanks to Microsoft. According to Epic Games' Mark Rein (via CVG), unresolved issues with downloadable user mods on the Xbox 360 led the developer to delay the shooter until "some time after the new year." Rein also confirmed this news to Joystiq in an interview to be published tomorrow.

Because of the closed nature of the Xbox Live network, setting up a system for PC users to share mods with Xbox 360 users would be challenging, especially since there is no cross-platform connectivity via Microsoft's Games for Windows Live. "And Microsoft's got a very busy Christmas schedule... We just couldn't get enough attention from them to solve that problem," he told MCV.

"Worst case scenario would be Epic bringing popular mods onto the 360 and putting them through the certification process," Rein told us. "Because that's the way it works today. Or selling them in Marketplace, or convincing Microsoft to let us give some away for free," he said.

"That's the worst case scenario. Hopefully it will be better than that, but we know nothing yet about how that's going to work and that's why we're totally concentrating on the PS3 right now, in terms of consoles," he said.

This article was originally published on Joystiq.

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