Autodesk does not provide (aka does not exist) a converter for DWF/DWFx type files. Sorry.
To just "open" DWF/DWFx you need to use the correct software, this one over there https://www.autodesk.com/products/design-review/download
To just "open" DWF/DWFx you need to use the correct software, this one over there https://www.autodesk.com/products/design-review/download