Hi,
try out the workaround here:
"PowerPoint opens presentations as Read-Only, won't allow editing when fonts
embedded" http://www.rdpslides.com/pptfaq/FAQ00637.htm
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You're talking about that "This presentation contains ..."-message in
PowerPoint 2003? If you don't have that font, you need to open it in
PowerPoint 2002 (or older) and save it again without embedding fonts.