Microsoft Office Open XML PresentationML Macro-Enabled Document (PPTM) files that are created with Microsoft PowerPoint 2007 or higher versions. They are similar to PPTX files with the difference that the lateral can't execute macros though they can contain macros.
Learn more about this file format here
GroupDocs.Editor (in GroupDocs.Editor.dll) Version: 188.8.131.52
public static readonly PresentationFormats Pptm
Public Shared ReadOnly Pptm As PresentationFormats
static initonly PresentationFormats Pptm
static val Pptm: PresentationFormats