Windows XP cannot open the chm File. Solution Summary

If Windows XP cannot open files in chm format,
1. If the prompt is: Internet Explorer cannot be linked to the webpage you requested or the page cannot be displayed after it is opened ". Download jjhd.zip and run it. Or right-click the CHM file you want to open, and a "unlock" option will be added to the attribute below. After you click it, it will be displayed normally.

Jjhd. reg content
REGEDIT4
[HKEY_LOCAL_MACHINESOFTWAREMicrosoftHTMLHelp]

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftHTMLHelp1.xHHRestrictions]
"MaxAllowedZone" = dword: 00000003
"UrlAllowList" = ""

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftHTMLHelp1.xItssRestrictions]
"MaxAllowedZone" = dword: 00000003
"UrlAllowList" = ""

Copy the preceding content to a text file, change the file name suffix to. reg, and click

2. If the prompt is: "cannot open the file mk: @ MSITStore: *****. chm"
This fault may be caused by Hhctrl in your system. ocx files are lost or are Hhctrl. if ocx is overwritten, you can copy one from the same computer or the installation disc and register Hhctrl again. ocx file: The procedure is as follows:
Step 1: Exit all running programs and click Start> program ";
Step 2: In the run dialog box, type "regsvr32 c: windowssystemhhctrl. ocx" enter, or "regsvr32/I hhctrl. ocx" the message "DllRegisterServer succeeded" is displayed. Restart your computer.

3. Other methods
3.1. Go to "language and Region"-"region options" from the control panel of windows. if the region is not Chinese, change it to Chinese.
3.2. simply change the file name to E (. chm), copy it to a root directory, open it and check if it doesn't work. Please download it again. Sometimes there is a problem with the download process and check whether it is OK.
3.3. If most CHM cannot be opened, try registering regsvr32 itss. dll again.
3.4, start -- run -- Enter "regedit", open the registry, and find the following branch:
HKEY_LOCAL_MACHINESOFTWAREMicrosoftHTMLHelp1.xItssRestrictions
Create a DWORD key MaxAllowedZone under it, and set the value to 3.
3.5 you have not installed the supervisor or deleted the hh.exe file. You can check it under Windowssystem32. If this is the case, you can copy a hh.exe file from someone else's computer, put it in the directory above, and double-click a chm file so that you can select the C: windowshh.exe program, which restores the association between the chmfile and hh.exe.
3.6. Delete "hh. dat" in the directory if the preceding conditions are good.
Documents and Settings \ % username % Application DataMicrosoftHTML Help. This file contains some content that may cause errors.

4. Start -- run -- Enter "regedit", open the registry, and find the following branch:
HKEY_LOCAL_MACHINESOFTWAREMicrosoftHTMLHelp1.xItssRestrictions
Create a DWORD key MaxAllowedZone under it, and set the value to 3.

5. You have not installed the supervisor or deleted the hh.exe file. You can check it under Windowssystem32. If this is the case, you can copy a hh.exe file from someone else's computer, put it in the directory above, and double-click a chm file so that you can select the C: windowshh.exe program, which restores the association between the chmfile and hh.exe.

6. If the preceding conditions are good, delete "hh. dat" in the directory.
Documents and Settings \ % username % Application DataMicrosoftHTML Help. This file contains some content that may cause errors.