Convert csm to x

What is the difference between .csm and .x?

Description: The .csm file type is a 3ds Max Character Studio Maker File, which is a proprietary format used by Autodesk's 3D animation software. It contains data related to Character Studio, such as biped skeleton and morph targets, as well as animation data. The data can be used to create 3D characters for animation and games.; X is a DirectX Model image file used by DirectX technology which is for 3D graphics rendering in games. The file format specifies 3D object structures for meshes, textures, animations, and objects.