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For UWPs, developers are not able to enable hardware mouse support themselves. There are a handful of UWP games which were previously published and worked with their appropriate account managers to coordinate with the platform team to test and enable hardware mouse support for their title, but it is not broadly available for UWPs. We currently have no intention on expanding the list of hardware mouse supported UWPs beyond the current list as the benefit was for games, which have all moved on to a newer development model not using UWP technology.
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