A DWFx file is a 2D or 3D drawing that may include design data, object properties, and descriptive metadata. It is similar to a .DWF file, but is formatted in XML, using the Microsoft XML Paper Specification (XPS).

Since DWFx files are saved in the standard XPS format, they can be opened with Microsoft's XPS Viewer, which is included with Windows Vista. XPS Viewer is also available as a free download for Windows XP users.