How to associate FCStd file extension to FreeCAD 1.0.0?

Question

I'm using Ubuntu 24.04 LTS and FreeCAD 1.0.0.

The problem is that FCStd files are zip files, and when I associate files with the FCStd extension, they will open as zip files, or if I select FreeCAD as the associated program, it will open zip files.

How can I specify that FreeCAD open files with the FCStd extension and not zip files?

Thanks!

UPDATE

I do the following to associate FCStd files to FreeCAD.

1. Right-click on the FCStd file.
2. Click "Open with..."
3. Click on the "Always use for this file type" toggle. I noticed it says "Zip Archive", even for FreeCAD files.
4. Click on FreeCAD.
5. Click on Open.

At this point, the file opens in freeCAD as expected. Here is where the issue is. If I double-click on a zip file, it opens FreeCAD and tries to open the zip file.

I then try the following:

1. Right-click on the zip file.
2. Click "Open with..."
3. Click on the "Always use for this file type" toggle.
4. Click on Files.
5. Click on Open.

It opens the zip file as expected. I then double click on an FCStd file, and it upzips it.

The issue is that FCStd files should ONLY be opened by FreeCAD, not by any unzipping program.