.docx, .pptx, .xlsx open as compressed folder in IE8.

A quick one today. I had a case where the customer reported that IIS 6.0 returned Office 2007 / 2010 documents (.docx, .pptx, .xlsx, etc.) as compressed (.zip) files.Checking the IIS metabase (C:\WINDOWS\system32\inetsrv\metabase.xml ) showed that he MIMEMap was set correct, i.e: ….docx,application/vnd.openxmlformats-officedocument.wordprocessingml.document.pptx,application/vnd.openxmlformats-officedocument.presentationml.presentation.xlsx,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet…  However, when inspecting what came back from the server with Fiddler, it…

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