What can replace WinHelp?

I produce online help in WinHelp format that we attach to a graphical-user-interface (GUI) overlay on our AS/400 applications. When the application user clicks the Help button, the online help opens to either the specific topic for that window or to the help system's Welcome page.

We would prefer to switch our help format to HTMLHelp (CHM file), but cannot because of Microsoft Security Update 896358. Some of our writers work on a server and some of our clients run applications (and therefore Help) on a server, and the security update, as some of you well know, will not allow CHM files to work on a server (at least not without some registry editing, which our software security people are not inclined to do).

If it is true, as I have been told, that WinHelp is essentially a dying (if not dead) format, and we cannot use CHM, what alternatives do we have? Is there anything else that can replace WinHelp? I know about the relatively simple workarounds if the CHM file is downloaded from the Internet, but that's not the case with us; it is attached to the application itself.

Does anybody have any suggestions? They would be much appreciated.

Thanks.