Models that were created using Musculographics' SIMM (Software for Interactive Musculoskeletal Modeling) toolkit can be imported into OpenSim.

To import a SIMM model:

Select File → Import SIMM Model… from the OpenSim main menu bar.
The Import SIMM Model window will appear and ask for the following information:
1. The SIMM model to be imported: specify this by clicking the folder icons to select the joint file (.jnt) and muscle file (.msl).
2. The new OpenSim model name: enter the name in the OpenSim file (.osim) textbox.
3. Whether or not a separate XML file for the model markers should be created when the model is imported: to create the XML file, select the check box next to Separate markers file (.xml) and enter a name into the textbox.
After specifying the information in the Import SIMM Model window, click OK.

Be sure to include the extensions when entering file names.

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