Files with TNT extension store 3D models. The extension is associated with TurnTool, an online application that runs in web browser. TurnTool service has been discontinued and is no longer available for users.

TNT format was developed in 2002 and is considered obsolete by modern standards. The format was never made compatible with Mac computers. No currently available tool or application supports TNT format and it is impossible to convert TNT files to other format.