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How to restore file association in Matlab 2015a for Windows

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The Matlab files are no more associated with Matlab.
In the previous version I have run the Application as Administrator and typed these commands
cd([matlabroot '\toolbox\matlab\winfun\private']);
fileassoc('add',{'.m','.mat','.fig','.p','.mdl',['.' mexext]});
disp('Windows file associations changed. FIG, M, MAT, MDL, MEX, and P files are now associated with MATLAB.')
If I try the same in Matlab R2015a doesn't work and give me the error Undefined function or variable 'fileassoc'.
If I try to associate the file type using right click directly on the .m file and choosing open with Matlab with the use always option enabled, the files appears associated but when I try to open the file, Matlab starts but doesn't open the file so I'm forced to start Matlab and open de file from open menu.
How could I fix this problem?
What happened to fileassoc command?
I'm on Windows 8.1 x64

Accepted Answer

Patrik Forssén
Patrik Forssén on 12 Jun 2015
I’ve just submitted a contribution to MATLAB FEX that can solve this problem for R2015a (and earlier versions): MATLAB File Association Fix


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alex on 25 Oct 2015
Hi. Being distracted, I wrote this comment under your fix where I don't think you can reply to. I am copy-pasting it exactly as it is:
I am really disappointed that this didn't work either. I am using R2014b and associated file is still the Starter Application, and clicking the .m file right now only opens a new instance MATLAB, not even a new instance of MATLAB with its editor open with the file. I'd be happy to hear any suggestion anyone gives.
zengshuishui on 13 Jul 2017
Thank you very much . This trouble bothering me for a ;ong time!
Qian Geng
Qian Geng on 3 Jan 2018
It works on my 2017b version very well. Long searching for this solution and finally got it. Thx.

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More Answers (5)

Yannis Gr.
Yannis Gr. on 16 Jun 2016
Edited: Yannis Gr. on 16 Jun 2016
A bit more help on how you should do this.
1)Download the file
2)Extract the file @ C:\Program Files\MATLAB\R2016a\mcr\toolbox\matlab\winfun\private . Change the R2016a according your version of course.
3)Navigate inside matlab to the same dir as above. (Run matlab as admin also)
4)Execute the command associateFiles('add',{'.m','.mat','.fig','.p','.mdl',['.' mexext]});
5)Take the .reg file it will create copy paste on desktop and run it.


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Cosmin Constantin Popescu
Cosmin Constantin Popescu on 21 May 2018
It worked by it required to unzip the archive directly in the specified folder (and in a new folder but that was just a default in my case). When I first run the registry file, I had a MATLAB instance open and the .m files opened externally ignored it. Instead, they all opened in a second MATLAB instance. At least that instance now behaves as expected. Thank you for the help and explanations!

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Murat Ates
Murat Ates on 20 Mar 2015
Copying 3 fileassoc files from
C:\Program Files\MATLAB\R2014b\mcr\toolbox\matlab\winfun\private
to the corresponding R2015a folder and running
fileassoc('add',{'.m','.mat','.fig','.p','.mdl',['.' mexext]});
on 2015a in the corresponding folder worked for me. Then you are able to see R2015a in the Windows default programs list i.e.
Control Panel\All Control Panel Items\Default Programs\Set Default Programs
Matlab starter's icon disappeared though. I checked registry of Windows, and command just mirrored whatever is done for 2014b to 2015a.
If you don't have those 3 files, you may export registry settings for Matlab in 2014b, modify and run it if you installed 2014b on that machine. Backup whole registry before doing this. Registry settings are located at:

  1 Comment

Andrew Farsech
Andrew Farsech on 22 Mar 2015
The problem is that now I have installed only the R2015a and I'm not authorized to install any previous version on this pc... could you upload fileassoc files? I have contacted the official support but still no answer.

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federica cirillo
federica cirillo on 31 Jan 2018
Edited: federica cirillo on 31 Jan 2018
it doesn't work for me! I obtain "Failed to create registry file". can you help me? I'm using R2017a version

  1 Comment

Quentin Guillaumin
Quentin Guillaumin on 2 Jul 2018
I had the same issue, add a path to indicate where to save the registry such as 'C:\Users\bob\Downloads\regisry' in the fileStr entry of the function, I worked for me.

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