How to create a Gnome desktop starter for FreeCAD?

I want to create a Gnome desktop starter for the FreeCAD Appimage but it is not working/starting the FreeCAD application:

I created a file called FreeCAD.desktop with the following content:

[Desktop Entry]
Type=Application
Name=FreeCAD
Terminal=false
Exec=/home/klaus/Anwendungen/FreeCAD-0.20.0-Linux-x86_64.AppImage
Icon=/home/klaus/Anwendungen/FreeCAD.jpg
Categories=Application;

The file is located in: /home/klaus/.local/share/applications

I checked “execute as application” but there is a note “unconfined_u:object_r:data_home_t:s0” regarding security when I right click on the file in the Gnome file browser.

The application will only be used by the local user.

How can I create a Gnome starter?
(I used Solus Linux in the past where the approach worked fine.)