Many users have the problems on opening chm files after installed  Windows 7 operating system.Chm files is the help file type of e-books, in Windows 7 chm files can not be opened because of security issues. Many users do not know how to solve this problem after encountered chm files can not be opened. Here we will analyze this problem that chm files can not be open in Windows 7,help users solve the trouble .

The solutions of can not open chm files in windows 7:

help chm properties



Solution 1:

1.If prompted "Internet Explorer can not link to the page you request "or" the page can not be displayed ". Right-click the CHM file to open the properties, here is one more attribute "unblock".After clicking it the CHM file may become properly.

 2.Save the following as *. reg file in Notepad.

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp] [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\HHRestrictions] "MaxAllowedZone"=dword:00000003 "UrlAllowList"=""[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\ItssRestrictions] "MaxAllowedZone"=dword:00000003 "UrlAllowList"=""

Solution 2:

If you are prompted for "Can not open file mk: @ MSITStore:\***. Chm, the reason caused this failure may be" Hhctrl.ocx "system file is missing or overwrite by other versions of" Hhctrl.ocx ".You can copy it from the other computers or the installation CD, and then re-register "Hhctrl.ocx" file.Click Win+R ,type "regsvr32 c:\windows\system32\hhctrl.ocx",then it prompts "DllRegisterServer succeeded".

Solution 3:

Try to re-register the itss.dll, right-click  chm files associated "Open with" to c:\Windows\HH.exe. Command line run regsvr32 itss.dll and regsvr32 hhctrl.ocx.

 Then you can solve the problem can not open chm files in Windows 7.

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