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“The file is corrupt and cannot be opened” when opening Outlook Attachments with Office 2013

September 10, 2012 42 comments

I left Outlook 2010 installed when I upgraded to Office 2013 because we’re still using Exchange 2003 which is not supported by Outlook 2013.

After upgrading, I couldn’t open any attachments directly from Outlook, even after downloading them first.

Excel, Word and PowerPoint would give me an error “The file is corrupt and cannot be opened”.

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After manually downloading the attachment, I received the same error. I found that when I looked at the file properties, Office marked the file with a nice message: “This file came from another computer and might be blocked to help protect this computer.”

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I found that in order to prevent this behavior, I had to change some settings in Excel.

File > Options > Trust Center > Trust Center Settings…

Click the “Protected View” menu item and uncheck the three security options. This must be repeated for Word and PowerPoint as well.

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The message is still there in the file properties after downloading a file attachment from Outlook, but now Office doesn’t complain when trying to open them, nor does Outlook.

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Categories: Microsoft Office