How do I let Matlab run the selected .mn file automatically in the MuPad notebook?

After installing Matlab and the Symbolic Math Toolbox including the MuPad notebook, when I would run a MuPad-file (.mn extention), Matlab would run and open the MuPad notebook automatically. However, somehow I changed some file paths, and now I have to actively call the MuPad notebook in Matlab itself and select the appropiate MuPad notebook file, which is a slower process.

[Nikhil Sreekumar]

Hi Vic,

You mentioned that some paths were changed. may I know which all. Also, if those paths were changed accidentally, please try the following commands and see if this solves the issue.

   % try rehash first, see if it solves the issue and then if you need to 
   % return to factory-installed state then use restoredefaultpath
  >> rehash
  >> restoredefaultpath

• restoredefaultpath is intended only for situations where MATLAB is experiencing startup problems due to a corrupt search path. For general search-path clean up, use the rmpath function or the Set Path dialog box.
• rehash with no arguments updates the MATLAB list of known files and classes for directories on the search path that are not in matlabroot/toolbox

Thanks

Nikhil