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IFC 4.3 Extension (Update 4) for Autodesk Civil 3D 2022: [ + show all files ]
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Download the file and open it in the respective application, or copy it as instructed (ates).
How to load a LISP application (.LSP/.VLX) into AutoCAD? See the Tip 7245.
Many other files also on ARKANCE Helpdesk, CAD blocks in the Block catalog.
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