KB Article: http://support.microsoft.com/kb/928890
When you try to open a publication in Microsoft Publisher, you mayreceive one of the following error messages, depending on the version ofPublisher that you are running:
Publisher cannot openthis file. This is not a Publisher file.
Publisher cannot open thefile.
Publisher has detected aproblem in the file you are trying to open. To protect your computer, Publisherwill not open the file.
To verify the error message that you receive, press CTRL+SHIFT+I.The following number is displayed in the lower-right corner of the errormessage dialog box:
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