SharePoint | Opening files require logins?!

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So your sharepoint users login into the site and still have to log in each time they open a file?

Try these

http://sharepointinsight.wordpress.com/2008/07/18/how-to-get-rid-of-login-prompt-while-opening-documents-in-microsoft-office/

http://support.microsoft.com/default.aspx/kb/943280

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