Problem with CAD files

  • 1 July 2021
  • 1 reply


Since the last update we cannot access CAD/STP files in our designs. We get the following error:

Files are in the mentioned folder.

Opticstudio file worked perfectly before the update. Do you have a solution? This is causing delays in our project.


Lucía Suárez

1 reply

Userlevel 7
Badge +2

Hi Lucía,

I'm not sure why you get this error, but you can always re-install a previous version of Zemax if it is causing delays to your project. You can find older installers under the Legacy Version tab of this page.

You can also try to untick Setup..Project Preferences..General..Use ACIS Libraries, but I doubt it'll make a difference.

Take care,