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For a Microsoft Word 2002 version of this article, see 324328.
If you use Internet Explorer to open a Microsoft Office Word 2007 or Microsoft Office Word 2003 document in a Web site, and you either click Back or close your Web browser window, you may be prompted to type a user name and password.
Also, if you open a read-only Word document directly from a Web server, and then close Word, the Authentication dialog box may appear.
This problem may occur if Internet Explorer tries to write the document file name to the list of most recently used files. To write the file name to the most recently used list, Internet Explorer tries to obtain read/write access to the document.
This problem may also occur if Internet Explorer tries to add the Word document to the most recently used list when the client has a Web folder that points to the Web server where the Word document resides. For example, this problem occurs if you locate the Word document at http://www.example.com/word.doc, and you also have a Web folder that points to http://www.example.com. By default, the Web folder is trying to gain read/write access to the document.
Note In this example, www.example.com represents the name of your Web server.
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
To resolve this problem, you must add the DontAddToMRUIfURL registry value. To do this, follow these steps:
Click Start, and then click Run.
In the Run dialog box, type regedit, and then click OK.
In Registry Editor, locate the appropriate registry subkey: