Hi Lajos,
The above added (Door and Window) file is a SH3D furniture plugin.
So it can be imported as a furniture library from furniture menu.
To get open space for open doors you should know about PluginFurnitureCatalog.properties and a (svg cutout shape)script behind it.
In the SVG Path cutOut Guide pdf file page No.9,10 explains it correctly. But sorry to say
I can't explain about it because it does not work completely with me (may be because of bad 3d model door or failed to understand the wall thickness relation with the door).
So you can feel free to ask to Emmanuel Puybaret (SH3D developer) or okh (SVG quick-guide publisher) or hansmex (Senior Member&forum guide).
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