X File Format ((better)) -

The format is designed to be and template-driven , allowing developers to define their own data structures while using a set of standard primitives.

The , or DirectX Model format, is a legacy 3D graphics file type developed by Microsoft for use with its DirectX API. Originally introduced in the mid-1990s following Microsoft’s acquisition of Rendermorphics, it served as the standard for storing 3D meshes, textures, and animations for Windows-based games and applications. Key Characteristics of the .x File Format x file format