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New instance of matlab opening every time I double click a matlab file

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Hi Every time i double click a matlab file (*.m, *.mat or *.fig) in an explorer windows, a new MATLAB instance starts, even if another one is already opened.
I read the answer here.
The matlabroot folder, however, is on a shared network drive for which I don't have administrator right (and I cannot ask for them).
To solve the issue I looked at the answer here.
I copied the pathdef.m file in my userpath folder. However the issue is still present. How can I solve it?
I'm using MATLAB 2015b

Accepted Answer

Harish Ramachandran
Harish Ramachandran on 1 Feb 2018
Edited: Harish Ramachandran on 1 Feb 2018
Hi Luca. Did you try the second part of the solution provided in the link ?
Please run the file exchange code and restart MATLAB.
This page explains how to re-register the .MAT extension, but you can follow the same instructions for other file types.

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