If you try to convert a .vtx file without the accompanying .ani or .mdl animation files, you will only get the T-pose/reference pose.
There are several compelling reasons to perform a VTX to FBX conversion: vtx to fbx
You cannot import a compiled .mdl into a DCC (Digital Content Creation) tool. You need Crowbar—the standard tool for decompiling Source models. If you try to convert a