I found there is a security problem about shtml.exe that allows anyone to explore the local path of IIS web server. Tested on windows2000 server.shtml.exe is a program issued with Forntpage Extention server for viewing smart HTML file, If we install Frontpage on Windows2000 server, a directory names "/_vti_bin" will be installed on web root directory. Normally we can view HTML file or SHTML file by the following method: http://210.145.32.98/_vti_bin/shtml.exe/postinfo.html shtml.exe only accepts html¡¢shtml or htm files, if the requested file does not exist, we will get the local path of the web directory: http://207.69.190.42/_vti_bin/shtml.exe/postinfo1.html We get the following message: Cannot open "d:\inetpub\wwwroot\postinfo1.html": no such file or folder. By the way, if we request file that does not exist and the extention file name is not html, shtml or asp, such as http://207.69.190.42/_vti_bin/shtml.exe/postinfo1.exe, We'll get different message: Cannot run the FrontPage Server Extensions' Smart HTML interpreter on this non-HTML page: "postinfo1.exe"