Files with the TS1 extension are used by VirtualBus. This is a free bus driving simulator game. TS1 files are used to store data related to textures applied to in-game vehicles. However, they do not contain the actual image files, but only define their location. Texture (skin) files are stored as 2D images.

TS1 files are plain text files which are supported by all text editors. The author of VirtualBus game is Marcin Kompanowski.