ARCHICAD 20 can back-save project files in ARCHICAD 19 format only (among previous ARCHICAD file formats).
Important: When saving an ARCHICAD project as an earlier version project, an alert will appear warning you that elements and information not supported by the older version will be discarded.
When back-saving your ARCHICAD 20 project to version 19, any library parts that were revised for 20 will be automatically replaced by their original counterparts in version 19.
Note: If the object in ARCHICAD 20 has acquired additional parameters or functions compared to the version in ARCHICAD 19, those new features will be lost when you back-save the object to ARCHICAD 19.
In the Options of the Save as dialog box, you can uncheck the Convert library parts backward checkbox. This way, the library parts revised for the latest version will not be replaced by their original counterparts in the previous version, and will be shown as “missing”.
These files are vectorial drawings saved from ARCHICAD’s 3D Window (using the Vectorial 3D Engine). These drawings contain no model information and can be touched up in the Floor Plan with 2D tools.
Important note: In the 3D Window, this option is only available with the Vectorial 3D Engine – not available in OpenGL mode.