Visio Stencil XML File (.vsx) refers to stencils that consist of drawings and shapes that are used for creating diagrams in Microsoft Visio. VSX files are saved in XML file format and was supported till Visio 2013.
Learn more about this file format here
GroupDocs.Viewer (in GroupDocs.Viewer.dll) Version: 20.8
public static readonly FileType VSX
Public Shared ReadOnly VSX As FileType
static initonly FileType^ VSX