1.Open Windows File Explorer (Open Start in Windows and type File Explorer.)
2. Locate the problematic file on your computer.
3. Right-click the file and select Properties.
4. In the Properties dialog box, look for an Unblock button near the bottom right. If it exists, click Unblock, then click Apply, and then click OK to dismiss the dialog box.
The Properties dialog box with the Unblock command
5. Now, attempt to open the presentation again. Right-click the file in File Explorer and select Open.
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This
guide will walk you through PowerPoint file recovery the process.