What version of LabWindows/CVI are you using?
In LabWindows/CVI 6.0 the installer is based on .msi Microsoft Installer technology, which uses an .msi database for all of the installation information. You can find documentation on the .msi database format at http://msdn.microsoft.com There are several different tools you can use to create/modify your own installation scripts, such as ORCA or the Windows API functions for modifying .msi databases.
If you are using CVI 5.5.1 and earlier, the installer package was another 3rd party utility called InstallIt! The company that developed this installer package is no longer in business and National Instruments has never archived documentation for this technology. You can search the internet for references to Install
It! as well as some newsgroups like info.labwindows and often times there are people you can contact to find out more information about the InstallIt! script language.
Jason F.
Applications Engineer
National Instruments
www.ni.com/ask