A DWFx document is an AutoCAD DWF file formatted to work for Microsoft’s XML Paper Specification (XPS). This is included with Vista and viewers are available for other operating systems. XPS is a direct competitor to Adobe’s PDF technology and is better suited for graphics intensive documents.

You need the Microsoft XPS Viewer to open a DWFx document. This is already integrated into Vista, but it is also installed with the .NET 3.0 Framework or as a download for Windows XP. The viewer is built on the Windows Presentation Foundation and will work on Windows XP, 2003, Vista, and higher.

I would recommend the Autodesk Design Review application for working with DWFx’s because it provides greater functionality than Microsoft’s viewer. The application is a free download from Autodesk.

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