Visio Macro-Enabled Drawing Template (.vstm) are template files created with Microsoft Visio that support macros. Unlike VSDX files, files created from VSTM templates can run macros that are developed in Visual Basic for Applications (VBA) code.
Learn more about this file format here
GroupDocs.Viewer (in GroupDocs.Viewer.dll) Version: 20.7
public static readonly FileType VSTM
Public Shared ReadOnly VSTM As FileType
static initonly FileType^ VSTM
static val VSTM: FileType