|Type of format||3D model format|
It is a simple file containing geometry meshes and material information that can be viewed in the DirectX Viewer, a program available with the 2008 DirectX June SDK (Software Development Kit). Because the SDK provided the means to load and save assets in this format, it was often used as a simple way of getting assets into and out of game programs. As of 2014, the file format has been deprecated for a long time  and the interchange role is better served by a more modern format like Autodesk FBX.
- dotXSI - a extended format of X file format
- Microsoft - X Files (Legacy) (Direct3D 9) https://msdn.microsoft.com/en-us/library/windows/desktop/bb174837%28v=vs.85%29.aspx
- Chuck Walbourn. "DirectX Mesh". Games for Windows and the DirectX SDK. Retrieved April 21, 2015.
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