I need help combining PowerPoint files into a single PDF

[Guest]

I am trying to combine office 2013 files into a single PDF, word and excel files are ok, however PowerPoint files are stating that they are read only. They are not and only statie this once they are open.

Has anyone else experienced this?

[CtDave]

When a file is opened in its native application other applications will "see" the file as read only.

Something to try. Output each powerpoint file to PDF in turn. Using Acrobat (not Reader) combine the two PDF files.