Convert md5mesh to x

What is the difference between .md5mesh and .x?

Description: MD5MESH is a 3D mesh file format used by the video game Doom 3. It stores mesh data in a format that is used to render 3D models in the game. It contains data such as vertex positions, texture coordinates, vertex normals, triangles, and skinning weights.; 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.