A stencil (.vss) is a collection of smartshapes that can be used to quickly create flowcharts with certain shapes and graphics. You cannot directly convert VSS to VST, however you can use .vss files for creating .vst files in MS Visio.
Convert Microsoft Visio smartshapes data to Microsoft Visio flowchart.
We found one software available in the database for this conversion.
Microsoft Windows software - convert vss to vst 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.