I have a Powerpoint pptx presentation which reports and error when I attempt to open it. The system may have been turned off in the middle of a PowerPoint session. The file was a pptx file from a later version of PowerPoint. I loaded into a 2007 version and it still came up with an error but offered to repair which it did. I saved the repaired version to the old format for use with PowerPoint 2003.
What is good software for PowerPoint file recovery?
I didn't find the right solution from the internet.