3DXML format is proprietary and usually only supported in Dassault Systemes software. However, some dedicated 3D model converters, such as CrossManager, seems to support import of .3dxml files and can convert the models to other 3D formats.
Convert Dassault Systems Universal 3D XML document to CAD 3D part or component.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert 3dxml to prt on Windows
A CAD converter with huge format support
Convert from 3dxml file format
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.