How can I open the CHM File in windows?

CHM indicates Compiled HTML. A file icon with the CHM extension is usually a document icon with a question mark, indicating a help document. It is a file in the help document format provided by Microsoft since Windows 98,
Used to replace the HLP (HELP) file in Windows 95. Since Windows 98, Microsoft has built-in interpreters (tools for opening the CHM File) in the operating system, that is, HH. EXE under the Windows installation directory.
The CHM file can be generated by providing HTML Help Workshop for free on the official website. Its source file is an HTML file. Nowadays, many e-books on the Internet are produced in chm format.

1. Register hhctrl. ocx again. Try regsvr32 hhctrl. ocx.

2. HH. EXE uses MS-its and other protocols. These protocols should be provided by an itss. dll. Re-register the DLL: regsvr32 itss. dll.

Specific Method:
1. Start running. Enter regsvr32 c: \ windows \ system32 \ hhctrl. ocx. OK. Re-associate the file.
2. Execute hh.exe in the Windows directory.
Sometimes the CHM file cannot be placed in the Chinese directory. Including the Chinese CHM name. Try to test the file. Change the Chinese name.
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Or
1. Download hhupd.exeon the Microsoft website, install hh.exe, and run it.
2. Download hhupd.exe and run it. The size of this item is 461kb.
3. Find the "hhctrl. ocx" file in c: \ windows \ system32 and run: "regsvr32" C: \ windows \ system32 \ hhctrl. ocx...
The network cannot be resolved, and hhupd.exe cannot be downloaded. I will directly execute regsvr32 c: \ windows \ system32 \ hhctrl. ocx and it will be OK.