Whilst you can create both drawings (.vsdx) and stencils (.vss) in Microsoft Visio, it is unlikely that you could converted between each other, because they server different purpose and are made differently. In any case, working with Visio is likely your only option to at least partially achieve this.
This conversion entry was verified by us and conversion was flagged as wrong or not possible.
Usually this happens when the conversion would try to convert different types of data between each other, such as audio to image, or it is not possible because incompatibility between programs, caused by closed file formats, very limited support etc.
If you find entry that you feel is flagged as bad wrongly, please tell us in the discussion below with as much as information as possible so we can fix it.