A POTM file is a macro-enabled presentation template created by Microsoft PowerPoint, a program used for creating slide show presentations. It contains default images, slide templates, macros, and formatting. POTM files are used to create multiple .PPTM files with the same formatting and macro settings.
DOTM file has two attributes namely Zip file compression and XML (Extensive Markup Language). It is identical to .DOCX and .DOCM file in which the M stands for macro and the X stands for XML. The application that can open both .DOCX and .DOCM is via Microsoft Word version 2007 or 2010.