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.
DOC is a file extension for word processing documents. It is associated mainly with Microsoft Word application. DOC files can also contain charts and tables, videos, images, sounds and diagrams. It supports almost all the Operating Systems.