Answer
Explanation
The IGSS help system uses different window types to display different kinds of information. One of the window types is the so-called WinHelp secondary window. The IGSS help system uses the WinHelp 2000 format which depends on a .dll file called Roboex32.dll. This .dll is installed with the IGSS system, but the version distributed up to Help Update 3 did not support secondary windows. This caused WinHelp to crash.
Solution
If you’ve already downloaded Help Update 3, the problem is solved. If not, download it.