Other VSSX conversions

Conversion of vssx files to vsx file format

It will be probably very hard or even impossible to actually achieve vssx to vsx conversion without Visio, because the support for Visio formats is limited in 3rd party apps. But with MS Visio you can simply open up your .vssx file, right-click on the stencil header, select Save As, and select .vss as the file type and you will get it. 

Open VSSX file    Open VSX file

Related software

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Microsoft Visio

A vector based diagramming software from Microsoft