Files with .VSX extension refer 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.Conversion (in GroupDocs.Conversion.dll) Version: 22.214.171.124 (21.5)
public static readonly DiagramFileType Vsx
Public Shared ReadOnly Vsx As DiagramFileType
static initonly DiagramFileType^ Vsx
static val Vsx: DiagramFileType