Notes about the PMPPKG file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The PMPPKG file type is primarily associated with 'Pegasus Mail' by David Harris. If a mail recipient opens or double-clicks any attachment with the extension .PMPPKG, Pegasus Mail will assume that it is a preferences package and will offer the user the option of merging the preferences settings it contains with his/her current preference settings.