big problem.My error log is filled with these errors.This is due to being visited by a user who has installed Microsoft Office and Internet Explorer, and who has enabled the "Discuss" toolbar in his browser. When that toolbar is enabled, the browser will automatically query for these two files when visiting each site, to determine whether the Office Server Extensions are installed. Now I dont want to install Office server extension bcoz it will enable a user to view directories stored in my web server. Is there any other reason for these files coming in the log and how to rectify this thing.