Hi,
Installer Tool (Installutil.exe)
The Installer tool allows you to install and uninstall server resources by executing the installer components in a specified assembly. This tool works in conjunction with classes in the System.Configuration.Install Namespace. Go through the link below which contains complete description about the exe file.
http://msdn.microsoft.com/en-us/library/50614e95(VS.80).aspx
Let us know if this helps
Regards
Sreekanth.