How to solve the problem that the CHM file cannot be opened

Recently I changed my computer and downloaded the JDK user manual. When I opened the manual, the prompt "this page cannot be displayed" was displayed, while the directory tree is displayed normally, which is strange. So I found a solution.

 

Microsoft's official explanation is that some websites and HTML Help documents cannot work after Security Update 896358 or 890175 is installed.

Address: http://support.microsoft.com/kb/892675

 

But I thinkArticleThe update does not seem to be necessary. After all, the CHM contains much less viruses than the EXE, so the Registry method is actually used:

 

=========== Do not copy me, start ================

 

Windows Registry Editor Version 5.00

 

[HKEY_LOCAL_MACHINE/software/Microsoft/htmlhelp]

[HKEY_LOCAL_MACHINE/software/Microsoft/htmlhelp/1.x/ hhrestrictions]
"Maxallowedzone" = DWORD: 00000003

[HKEY_LOCAL_MACHINE/software/Microsoft/htmlhelp/1.x/ itssrestrictions]
"Maxallowedzone" = DWORD: 00000003

 

=========== Do not copy me, end ==============

 

This is a fundamental solution, or there is a solution for separate CHM files:

Right-click the CHM File, select "properties", and click "unlock.