abdab35,
HTML Help Shortcut commands were permanently disabled in
non-local CHMs by a Windows security update (numbered
323180) that
Microsoft released two years ago. There is no way to re-enable
them, unfortunately; applying the workarounds to the more recent
896358 security update doesn't have any effect in this case.
If you need to implement Shortcut-like functionality in a
remotely stored help file, one possibility is to use the
KeyHelp ActiveX
control. This provides a KeyShortcut command that performs the
same function as the standard Shortcut command but isn't subject to
Microsoft's security restrictions. The only drawback is that you
must install KeyHelp on your users' machines.
Pete