Then do the most telling verification: scan for files sharing the same core name—if `robot.dx90.vtx` is placed next to `robot.mdl` and `robot.vvd` (optionally `robot.phy`), you’re almost certainly viewing a Source model set designed to work as one compiled unit, whereas a plain `something.vtx` lacking the `dx90/dx80/sw` scheme, missing `.mdl/.vvd` partners, … Read more