Just found an alternative way to reliably fix this problem...
I "upgraded" to Office Mac: 2011 and found I had exactly the same problem. I usually present from KeyNotes but distribute in PPT format to share slides with others (pdf isn't really an option). The way I solved it was.
Reinstall Office Mac:2008 - you can choose to Customise and only select Powerpoint if you wish (I have to run Entourage as well as we aren;t on Exchange 2010 yet but thats another story)
Next export you Keynotes presentation on Powerpoint format as normal
Open your exported ppt with the 2008 version of Powerpoint and Save it (as a ppt)
You should now find that Powerpoint 2011 will now open it without any problems.
Rubbish I know but it seems to work well for me at least. FWIW I see this firmly as a Microsoft Office Mac: 2011 issue
Best of luck
covhill MANY THANKS! Your post gave me the solution.
My user was exporting out of Keynote '09 v5.0.5 and trying to open in PowerPoint 2008 v12.2.9 and it was giving:
"There was an error accessing <path to file>"
when we tried the exported file on other lesser versions of PowerPoint it opened fine (eg: v12.2.5)
so all I did was open and save and took that revised file back to the effected machine and then v12.2.9 opens fine!
Confirming Potential Solution:
I was receiving error that PPT was unable to locate file after exporting from Keynote.
Open the exported Keynote presentation (.ppt) format
Saved presentation as (.ppt) format from OpenOffice
Powerpoint could then open the file.
Hope it helps
I don't have MS Office and these solutions seem to involve owning both iWork and Office. Exports to Office formats used to work but now don't show Track Changes in Pages, mess up Numbers formatting and cause freezes for Office users. Collaboration is becoming quite impossible. Is Apple ever going to do a real update to iWork? It's been three years since anything significant and its exports are just not compatible with Office anymore. Love to find out what others are moving to.
Neither will import decently from iWork so I have to recreate my templates from scratch if I switch to Open Office or Libre Office. Open Office will open documents creating in iWork and saved as Office but loses formats and functionality. Libre Office will not even open Keynote docs saved as .ppt, although it will open docs created in PowerPoint.
I was seeking a different solution before completely giving up on iWork, because I certainly can't be going back and forth given their incompatibility. It looks as if Apple wants to drive everyone away from its office products forever, sigh.
Has anyone here actually tested Libre Office with collaborators in complex documents? By complex I mean reports with automatically generated Tables of Contents and indices, for example. Can you see and accept or reject each other's changes?