.pptm file is a Macro-enabled PowerPoint 2007 file.
Currently only PowerPoint 2007 and PowerPoint 2010 use this file type. Previous PowerPoint
versions use .ppt file type.
To break password protected Macro-enabled PowerPoint 2007 file (.pptm file) you can use
PowerPoint
Password program. PowerPoint
Password recovers all PowerPoint password types and supports all
PowerPoint versions (including PowerPoint 2007/2010).
Possible password types:
Password to open
Password to modify
PowerPoint document may contain a VBA project inside. To
recover password-protected VBA project you should use
VBA Password program.