In short, it's a shader for GunZ. Don't mess with it unless you know what you're doing.The VSO file type is primarily associated with 'NVIDIA' by NVIDIA Corporation. A vertex shader is a small assembly-language program used by Direct-X programs. When enabled, it replaces the transform- and lighting-computations of the fixed-function pipeline for vertices. The .VSO file is a compiled version of an .NVV file.
and i can open it somehow?