Found this great tip on preventing IE from opening office documents.
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Launch Windows Explorer.
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Select “Folder Options…“ from the Tools menu.
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Select the “File Types“ tab.
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Scroll down the list of “Registered file types“ until you find “DOC - Microsoft Word Document“ and select it.
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Click on the “Advanced…“ button at the bottom of the dialog.
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Uncheck the “Browse in same window“ checkbox.
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