Question

Whenever I double-click a .m files a new instance of Matlab is opened.
Is there any way to tell Matlab to keep every files in a single istance?

Matlab 2012a, Windows 8.

I only found an old guide that applies to XP. http://www.mathworks.com/matlabcentral/newsreader/view_thread/303080

Answer 1

Check out this post from The Mathworks, for Windows 7. The solution provides three suggested workarounds. The first one worked for me, so I’ll try to summarize here.

Solution

This is likely caused by Windows default security settings on your pathdef.m file:

• From _Windows Explorer, navigate to MATLABROOT\toolbox\local (where MATLABROOT is the directory returned by running matlabroot from within MATLAB).
• Right click on the file pathdef.m, and select the Security tab.
• Click Edit, select the Users group, click Full control.
• Apply changes, close the properties Window, and restart MATLAB.

If you had modified Matlab to launch as Admin, set it back to launch as a User. This should do the trick.

For complete details, and additional soltions, check out the original post.