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A "VTX" file isn't a standalone model; it contains hardware-specific mesh data (like vertex information) designed to work alongside an (the primary model file) and VVD (vertex data) file. To get an FBX, you first need to "decompile" these Source files back into a format like SMD or DMX , then export those to FBX. Step 1: Decompile the Source Files

To understand the conversion, one must first understand the Source Engine's modular file system. Unlike FBX, which is a container format, Source Engine models are split across three files:

Since direct conversion software doesn't exist (no "VTX to FBX converter" app on your desktop), you must follow a : VTX → MDL → SMD → FBX.