Update: Jakub Dvorsky has confirmed that everything mentioned below is true and that he was quoted accurately.
Original: XBLAFans is reporting that after six months of discussion Microsoft has refused Amanita Design’s award winning adventure game Machinarium for the XBLA due to the fact that they “don’t support games which aren’t Microsoft exclusives.” Meaning, available on other OS platforms than Windows as the game is available for both Mac and Linux.
The site claims founder and lead designer of the title Jakub Dvorsky informed them of the decision:
“Microsoft just refused Machinarium for XBLA after a half year of talking with them. They like the game and know it would be very successful on their platform, but they don’t want to support games which aren’t Microsoft exclusives. Machinarium isn’t, since we’ve also released versions for Mac and Linux. We have another option to approach some big publisher to bring the game to XBLA, which is quite absurd to do and lose maybe a large part of revenue because of that.”
Disappointing to hear to say the least. I haven’t heard of this policy before, and can’t come up with a case before this that can be applied. We’ve contacted both Amanita Design and Microsoft to confirm the facts and for any additional comment.

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