Fixing Diameter Symbol Displaying As MOD-DIAM instead of ø in SOLIDWORKS

I have seen that lot of people are having issues where symbols have changed to the scripts instead of display as symbols specially the Diameter symbol which instead of showing as ø, show up as <MOD-DIAM>.

Diameter Symbol as MOD-DIAM

OR even getting error message for missing Gtol.sym file.

Missing Gtol.sym File

Where as this is the correct behavior.

Correct Display

So let’s talk about different options to fix it.

1. Save and close all active files in SOLIDWORKS and restart it. This should fix the issue.

2. If you’re seeing the issue again then make sure there is no another instance/session of hidden SOLIDWORKS running in the background (could be a session that didn’t closed completely).

3. If 1 and 2 doesn’t help then either Gtol.sym file is missing OR corrupted.

For system running versions older than 2014, make sure that Gtol.sym is under C:\Program Files\SOLIDWORKS Corp 20XX\SOLIDWORKS\lang\English folder (path may vary in different version of SOLIDWORKS but make sure it located under \SOLIDWORKS\lang\English folder).

For versions 2014 and above, the default path is C:\Program Data*\SOLIDWORKS\SOLIDWORKS Corp 20XX\lang\English folder but you can opt for any folder location and map the path under Tools > Options > System Options > File Locations > Symbol Library File. In case there are multiple users, once can place the file in a common place that everyone can access.

Setting File Location

Program Data is a hidden folder by default. So make sure you’ve “Show Hidden Files, Folder, drives” checked as shown below.

Program Data Folder


In case you’re unable to find the file in the location mentioned above then you can copy it from different machine OR download here and copy to your machine in appropriate folder. Further make sure that you’ve mapped the file path correctly under Tools > Options > System Options > File Locations > Symbol Library File


5 thoughts on “Fixing Diameter Symbol Displaying As MOD-DIAM instead of ø in SOLIDWORKS

  1. Adir

    copiar a pasta “lang” do C: \ Program Files \ SolidWorks Corp \ SolidWorks e colar em C: \ Program Data \ SolidWorks \ SolidWorks Corp 2015 \ “. Isso deve resolver o problema.

  2. Engr. Zulfiqar Ali

    I was having the same problem and searched the web including your solution, almost all have explained the same. I tried to fix up and came to know that there is no folder of “lang” in C:\Program Data\SOLIDWORKS\SOLIDWORKS Corp 2015\”, but I found it in C:\Program Files\SOLIDWORKS Corp\SOLIDWORKS. From Solidworks, when I tried to map the path under Tools > Options > System Options > File Locations > Symbol Library File, I found that the button “Add” cannot be selected. To solve it (in another way), I copied the folder “lang” from C:\Program Files\SOLIDWORKS Corp\SOLIDWORKS and pasted it in C:\Program Data\SOLIDWORKS\SOLIDWORKS Corp 2015\”. This solved the problem.
    I don’t know how the directory of “lang” was deleted (if it is supposed to be there). Recently, I up graded Windows 8.1 to Windows10. This my be a reason but I am not sure.

    1. Deepak Gupta Post author

      It is there on my system so could have been deleted on yours. Further you can have only one location for the property file, so you need to press delete/remove the existing location and then you can add a new location.

  3. Chris Verge

    I just spent an hour on the phone with my Solidworks reseller uninstalling and re-installing 2015 to fix this problem without success. Then I found your post and the problem was fixed in 2 minutes flat. Thank you, thank you thank you.


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