OK now it doesn't find Java from /SW3D/Java but I guess I could make a link to it instead to copy the folder ?
I already successfully added a shortcut in my Menu but this run the script then nothing.
Entry in the menu for Sweet Home 3D is :
/usr/bin/flatpak run --branch=stable --arch=x86_64 --command=/app/bin/SweetHome3D --file-forwarding com.sweethome3d.Sweethome3d @@ %F @@
