I have a file saved in old PPT format. I'm able to open it in PowerPoint 2010 and previous version. It contains one simple macro which is not call during opening file.
When I try to open mentioned presentation in the newest PowerPoint (2013), application say that file is corrupted. When I click on "Repair" button, I see next message which inform me that some content was not readable and has been removed. It virtually means that I can see only empty slides (without content) after this operation!
I tried to open mentioned PPT file in PowerPoint 2010 and use "save as" option. When I saved it again in old PPT format, file became bigger, but I was able to open it in PP 2013.
I've tried to find a solution over the Internet, but almost everyone is talking about repairing corrupted PPT. From my point of view it can't be corrupted, because it works great in previous PowerPoint versions.