It should be possible to convert CAD data in DWF format to Parasolid X_T format either with some Autodesk programs like Inventor or a specialized 3D/CAD converter program or service.
Convert Autodesk Design Web Format to Parasolid model (text).
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert dwf to x_t on Windows
Autodesk Inventor is 3D solid modeling and design tool used to design and simulation 3D digital prototypes.
Autodesk Inventor shares 2D data from the AutoCAD and 3D design data from other Autodesk's applications. Autodesk Inventor is available for Microsoft Windows.
Convert from dwf file
to x_t file
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.