Repair a corrupted Keynote File
If you've experienced an error about a Keynote document not opening but gives you a message similar to the picture below, this tip may be able to help you solve the problem. It works most of the time. Thanks to all the people who contributed in this forum:
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1. Make a copy of the keynote document.
2. Change the extension of the keynote file to *.zip.
3. Unzip the file.
4. Add a *.key extension to the folder that has been uncompressed.
5. Walaa! Problem solved.
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Repair a corrupted Keynote File