Microsoft has updated knowledge base article 917607, "The Windows Help (WinHlp32.exe) program is no longer included with Windows operating systems starting with Windows Vista".

As many of you know, Vista has been released and, while it does NOT include the WinHelp 32-bit engine, customers who need it can download it from the Microsoft site. This KB article describes the new functionality of the WinHelp engine on Vista, including which macros have been disabled, settings that can be modified to override some of the security settings, and several others. (Does anyone know what "drag-and-drop functionality" was disabled? I wasn't even aware that there was drag-and-drop functionality in WinHelp!)

In my opinion, you should only be using the WinHelp engine for legacy content that doesn't need to be updated. No one should be developing new WinHelp content any longer...the technology is almost 20 years old and it needs to be put to rest.