Solution to CHM File index loss and unsearchable

Solution to CHM File index loss and unsearchable

It should be caused by the old version (4.x) hhctrl. ocx registered according to the so-called soil method on the Internet.

After registration, you can register hhctrl. ocx, Which is 5.2, to the system.
It bothered me for two days and two nights. I couldn't see how painful it was to write a program to open the manual ~~~ >_<
Finally, we found the technical information (HTML Help-Tech Info) of HTML Help, and found that a DLL closely related to indexing and searching has not been re-registered.
So I tried regsvr32 itircl. dll, which really worked!
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Summary method can be used
Regsvr32 hhctrl. ocx
Regsvr32 itss. dll
Regsvr32 itircl. dll // This is very important for full-text search.