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.
POTM file open in Microsoft PowerPoint 2016
The average PowerPoint user will most likely never come across a POTM file because it is used to save presentations with more functionality than a typical user needs. It supports the use of macros, which are script-like functions that are used to automate repetitive tasks and is used as a template for reproducing styles of templates. If you are simply looking to create basic presentations you can save them as .PPTX files. However, if you are looking to create a template that supports macros, you can save your presentation as a POTM file.
POTM files may be opened by PowerPoint 2008 for Mac or PowerPoint 2007 for Windows and later. They may also be opened by a previous version of PowerPoint with Open XML document support installed.