There is only one file type that uses the .TXD extension:
Game Texture Dictionary
A TXD file is an archive of textures, or small bitmap image files that can be referenced by games or other programs that support the Renderware 3D engine. It may be texture-mapped onto 3D objects to change their appearance.
TXD files are referenced by games such as Grand Theft Auto (GTA), and Tony Hawk's American Wasteland. They are used by games on both PCs and PlayStation consoles.
Textures within TXD files can be used to modify the look of objects within a video game. Examples include a car's paint job, t-shirt styles, or billboard advertisements. They can be viewed using various utilities for Windows or TXD Viewer for PS2.
Updated: May 22, 2020