Closed Powerpoint office 2016

[Stephen555]

Hello.
I noticed that PowerPoint Office 2016 does not work very well with pptx format presentation. I have one file in which i have inserted various changes. Now i am getting the error message.

Error message: Unknown format file

Is there another way to open the presentation?

Thanks

 

[robertJe]

• Quit PowerPoint.
• Rightclick the file's icon, choose Properties.
• At the bottom of the General tab, see if it offers an UNBLOCK option.
• If so, choose that, close the properties dialog box.
• Doubleclick the file's icon.
• With luck, it'll open now.

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[cupelix]

1. Try editing the file extention from .pptx to .ppt (make backup first of the file).
2. Or save the file with backward compatibility.
3. Or save it with a different file extension.