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APIs such as Direct3D and DirectSound need to interact with hardware, and they do this through a device driver. Hardware manufacturers have to write these drivers for a particular DirectX version's device driver interface (or DDI), and test each individual piece of hardware to make them DirectX compatible. == Installation ==The new [http://www.gamesforwindows.com/en-US/AboutGFW/Pages/DirectX10.aspx Microsoft Games for Windows DirectX 10] page has the installer and steps to install. The web site is operated by Microsoft, it is not a 3rd party site. It is interesting to note that DirectX is necessary for some video capture software, which is not game related, yet Microsoft makes the existence and download point entirely game oriented.* Go Directly to the DirectX 10 download at Microsoft.com: http://www.microsoft.com/downloads/details.aspx?FamilyId=2DA43D38-DB71-4C1B-BC6A-9B6652CD92A3&displaylang=en