The only software capable of working and converting of VSS smartshapes and VSSX stencils is Microsoft Visio. No other program suitable for this conversion is known to us.
Convert Microsoft Visio smartshapes data to Microsoft Visio stencil file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert vss to vssx on Windows
A vector based diagramming software from Microsoft
Convert from vss 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.