IISreset.exe is a magical command that resolves many problems! Err… well, yeah that command restarts all IIS related processes and thus essentially running it cleans up all the “mess”. So is there anything special about IISReset.exe in Windows 2008? Yes...
For IIS 6.0: ASP.NET Forms authentication will only secure content that is processed by the aspnet_isapi.dll (mainly .aspx files). If you need to replace other static file types (such as text files, video files, etc...), you can do that by mapping them...