To export an OpenSim model as a SIMM model:

Select File → Export SIMM Model… from the OpenSim main menu bar.
From the Export SIMM Model window that appears, click the folder icons to select the location to save the joint file (.jnt) and the muscle file (.msl) for the SIMM model.
When you click the folder icon, a Save dialog box will appear. In this window, enter a name for the file in the File name textbox, and then click Save.
The Save dialog box will close. Then click OK in the Export SIMM Model window.

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