LAST CHECKED:
October 29, 2026


Emil Rindell

Jonas Bryntesson

Henrik Andersson
PUBLISHED:
2023-07-20

Emil Rindell

Jonas Bryntesson

Henrik Andersson
2023-07-20
Sometimes when you have installed a new version or installed a software that uses the same file type as ironcad, you may lose the file association to ironcad. The latter can happen if you install Outlook after ironcad, since *.ics is the file format for ironcad's 3D scene as well as Outlook calendar files.
Or that when you double-click on, for example, a *.stp file, COMPOSE opens, or an older version of ironcad opens if you double-click on an ironcad file. This post goes through a few different ways you can fix this.
You use this method so that the *.ics files are associated with the correct version. Start by closing ironcad. Go to the Windows Start menu and scroll down to IronCAD mechanical > IPROSettings

Then go to the tab Utils > Choose you IronCAD application and select the version of ironcad you want to associate with from the dropdown menu

Then click Apply

Followed by Ok

And Ok

When you now double-click on an ironcad file, the correct version of ironcad should start. If the above does not work and, for example, 3D files are still associated with Outlook calendar files, you can follow the next step, as this method works both for the Outlook calendar issue and if *.stp files are associated with COMPOSE.
Sometimes you still need to force the file association via Windows if the IPROSettings tool does not function correctly. In the example video above, we show how to change the association from Outlook Calendar to the IRONCAD 3D scene, but this method also works if *.stp files are associated with COMPOSE. Right-click the incorrectly associated file and select Open with > Choose another app

First check the box Always use this app to open .ics files then click More apps

Scroll to the bottom of the list and then click Look for another app on this PC

Now browse to this *path: C:\Program Files\IronCAD\*EDITION*\bin then select IRONCAD.exe and click Open...
* Replace *EDITION* with the version you want to associate with. Click here to see an example of how to do this.

Now it should be complete. Every time you click the file, you will associate that file with IRONCAD.
Hope this post answered your questions!