Open the document in Office Word. Click file> save as> word document> Save as type> Word Document> save and close out of Word. https://www.windows10forums.com/proxy.php?image=https%3A%2F%2Fnewsignature.com%2Fwp-content%2Fuploads%2F2013%2F06%2FWord-20131.png&hash=dc5454e0768b8c4280
Google's search results: http://www.powerpoint.repair/ https://support.microsoft.com/en-us/help/820703/you-receive-an-error-message-when-you-try-to-open-a-presentation-in-powerpoint
Below the links with information that can help you solve this problem: https://powerpoint.recoverytoolbox.com/ https://social.technet.microsoft.com/Forums/office/en-US/50c99db5-9167-44fe-b625-e2682fa682ca/corrupt-powerpoint-file?forum=officeitprolegacy
Ty Exchange Server Fix Toolbox. It fix corrupted mailbox application repairs email accounts separately and supports the parsing of very large databases. https://www.fixtoolbox.com/exchangeserverfix.html