1782 AutoCAD Design Web Format(DWFx) Model DWFx is the newest version of the AutoCAD Design Web Format (DWF). DWFx is based on the XML Paper Specification (XPS). DWF and DWFx are compressed file formats which can be suitable for distributing over the Internet for review. You can export a single drawing or publish multiple drawings and sheet sets into a DWF or DWFx file. 1 Digital Preservation Department / The National Archives 03 Feb 2017 This format is identifiable via a container signature in DROID 6 and later. 03 Feb 2017 fmt/977 PUID dwfx File extension Has priority over 1456 Open XML Paper Specification