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Here's an update on AutoCAD .dwg file formats by release. - IMAGINiT Technologies Support Blog
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AutoCAD Tip: How to find the version of DWG format without using AutoCAD – Cadline Community
Solved: Civil 3d entities turn into ACAD_PROXY_ENTITY when saving between folders. - Autodesk Community - Civil 3D
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AutoCAD DWGversion
Solved: Illustrator 2018 error loding Autocad DWG - Adobe Support Community - 9469751
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