There is only one file type that uses the .TS1 extension:
VirtualBus Texture Description File
Vehicle description file used by VirtualBus, a free bus driving simulation game; saves references to textures (2D graphics files) that are overlaid on the 3D vehicle model; also called a "skin" description file, since it configures the graphics for how the external surface area of the bus is displayed.
The file Desc.ts1 is the file used for setting bus textures. This file is sometimes edited by players that want to create custom bus packages.
NOTE: VirtualBus uses the .3DS format for models.
Updated: July 10, 2011