REST APIs and Free Apps for documents & images conversion on .NET device. Convert between PDF, Microsoft Word, Excel, Visio Stencil File, MHTML Web Archive, PPTX, Project, HTML, email and images using our Free Apps....allows you to convert between Visio Stencil File (VSSX) & MHTML...to VSDX VSSX to VSX VSSX to VTX VSSX to VDX VSSX to VSSX VSSX...