Visio Template XML File (.vtx) is a Microsoft Visio drawing template that is saved to disc in XML file format. The template is aimed to provide a file with basic settings that can be used to create multiple Visio files of the same settings.
Learn more about this file format here
GroupDocs.Viewer (in GroupDocs.Viewer.dll) Version: 20.8
public static readonly FileType VTX
Public Shared ReadOnly VTX As FileType
static initonly FileType^ VTX