When you try to open a Microsoft Office Word 2007 document, a Microsoft Office Excel 2007 document, or a Microsoft Office PowerPoint 2007 document in Windows Internet Explorer 7 or Windows Internet Explorer 8, the document may not open in the same window as Internet Explorer. Instead, a new Word 2007, Excel 2007, or PowerPoint 2007 window opens to display the document.
This behavior is by design. The 2007 Microsoft Office system intentionally sets a BrowserFlags registry value for its file types to force the documents to open within the Office application window and not inside the Internet Explorer window.
Certain editing features are available only when the document is open outside the Web browser. Additionally, the Office Ribbon may not work as expected in Internet Explorer. Also, security enhancements to Windows Internet Explorer 7 or Internet Explorer 8 running on Windows Vista make opening the document outside the low-integrity context of Internet Explorer (when running in protected mode) better for overall security and usability.
To change the registry automatically, click the Fix this problem link. Click Run in the File Download dialog box, and then follow the steps in the Fix it wizard.