A STYPE file contains texture shading and blending information used by various Call of Duty games, such as the original Call of Duty and the United Offensive expansion pack. It is referenced by the game to apply realistic shading and blending effects to particles that animate different impacts that occur during gameplay. STYPE files store information in plain text.

STYPE files are not meant to be moved from the game installation directory or opened manually. However, you can view the contents of the files with a text editor since they are saved in a plain text format.