You can import JT files as 3ds Max Body Objects.
When you import a JT file, 3ds Max displays a progress dialog and a progress bar; there are no import options. When import is complete, the Body Objects appear in 3ds Max viewports.
The JT Open Program develops and supports the DirectModel format JT for the visualization of 3D models.
3ds Max does not export the JT format.
Support for the JT format is provided by Autodesk DirectConnect. See Autodesk DirectConnect.