Set DefaultSaveFormat in Powerpoint

[AR]

Hi,

I have migrated from Office 2003 to Office 2007. But I still prefer to save
the files in 2003 format (.doc, .xls or .ppt).

I have set the default format in Excel and Word with the
Application.DefaultSaveFormat property. I can’t find a way to set it in
PowerPoint through VBA macros. (I prefer to set it through macros instead of
the modifying the menu option for default save format)

Any help would be really appreciated