Visio Macro-Enabled Drawing (.vsdm) are drawing files created with Microsoft Visio application that supports macros. VSDM files are OPC/XML drawings that are similar to VSDX, but also provide the capability to run macros when the file is opened.
Learn more about this file format here
GroupDocs.Viewer (in GroupDocs.Viewer.dll) Version: 20.11
public static readonly FileType VSDM
Public Shared ReadOnly VSDM As FileType
static initonly FileType^ VSDM
static val VSDM: FileType