The CHM has canceled the navigation to the page or the page could not be displayed.

Method 1
1. Double-click the. chm file.
2. In the Open File Security Warning dialog box, click to clear the Always ask before opening this file check box.
3. Click "Open".

Method 2
1. Right-click the CHM file, and then click Properties.
2. Click "Unblock" or "unlock".
3. Double-click the. chm file to open the file.

I. If it cannot be opened, you can recover file associations like this:
1. Start running, enter: regsvr32 C:\windows\system32\hhctrl.ocx, OK, re-associate the file.
2. Execute the hh.exe in the Windows directory.
Sometimes the CHM file is not available in the Chinese directory. Includes the Chinese CHM name. Try to get the papers out. The Chinese name is changed.

Two. 1. Download Hhupd.exe on Microsoft website, install hh.exe and run.
2. In fact, after downloading the Hhupd.exe, it is ready to run. This thing size is 461kb 3. Find the "Hhctrl.ocx" file in C:\Windows\System32 and run: "regsvr32" c:\windows\system32\hhctrl.ocx ...
The solution on the Internet is not feasible, can not download hhupd.exe. I directly execute regsvr32 c:\windows\system32\hhctrl.ocx is ok.

Workaround 2 is:
1. Right-click on "Open with" for CHM file to \windows\hh.exe
2, run regsvr32 itss.dll on the command line
3, run regsvr32 hhctrl.ocx on the command line

Three. may be HH. EXE has a problem with one of the components required. But I don't know HH. EXE will use some of the components, so surf the internet, it was suggested to re-register Hhctrl.ocx. I found the Hhctrl.ocx in the system directory, re-register a Hhctrl.ocx try: regsvr32 hhctrl.ocx. Still can't read the CHM properly.

That being the case, it is likely that there is a problem with the agreement. HH. EXE uses Ms-its and other protocols, which should be serviced by a DLL file. The question is, what DLL is it? Then Google search ms-its agreement. Finally found, the original is a itss.dll in doing services. However, the solution found online is to modify the registry.

To modify the ItssRestrictions registry key to enable a specific security zone, follow these steps:
1. Click Start, click Run, type regedit, and then click OK.
2. Locate and click the following subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\ItssRestrictions
Note If the registry subkey does not exist, use steps 2a and 2b in Method 1 to create the subkey.
3. Right-click the ItssRestrictions subkey, point to New, and then click DWORD Value.
4. Type MaxAllowedZone, and then press Enter.
5. Right-click the MaxAllowedZone value, and then click Modify.
6. In the Value data box, type a number between 0 and 4, and then click OK.
7. Exit Registry Editor.
Note: By default, the "MaxAllowedZone" value is set to 0. The following table summarizes the explanations of the "MaxAllowedZone" values for each item. MaxAllowedZone Local Computer Zone local Intranet zone Trusted sites zone Internet zone Restricted sites zone
0 Allow block blocking block blocking
1 Allow block blocking blocking allowed
2 allow allow block blocking allowed
3 allow allow allow allowed block
4 Allow Allow permission allowed

The registry is still not open after modification!
Try the lazy way-re-register Dll:regsvr32 Itss.dll.

Four. The language of the operating system is not Chinese (this often happens)
1. See if your OS is a Chinese OS? If your OS is not Chinese, then go to Control Pane to see the "Language and Region" option, open to see "Regional Options" is not China, this option for some software still have some images.
2. If your CHM file is in Chinese, there may be a default language setting problem. You may use the English version of Windows to set the language and country options in the Ragional and LANGUAGE options to Chinese (PRC) in LANGUAGE and advanced. You can do it.

Five. You can try to change the name of this file. For example, remove unnecessary symbols.

Six. If not, the last trick is to convert the ebook CHM format to a PDF file:
CHM Converter is a specially converted CHM file that converts CHM files into commonly used formats such as PDF, TXT, and Doc.
Http://dl.pconline.com.cn/html/1/6/dlid=11896&dltypeid=1&pn=0&.html

After downloading the software, the software is English interface, click the Menu "Tools-language", in the Pop-up dialog box, select "Chinese_simplified" can be converted to Chinese, the software also supports many other languages.

Select the language and click on the upper left corner of the "open" button to choose the CHM file to convert, if the CHM file is in English, then in the drop-down menu next to select "Defailt_charset", if it is in Chinese, it needs to select "Gb2312_charset" in the drop-down menu, Otherwise it will be garbled, and then in the right "export" to select the type of file to convert, the software supports many formats of files, such as select "Word97-2003" Here, and finally click the "Save Database as" button, select the Saved folder and then start the conversion.

Workarounds for *.chm files cannot be opened in PS:WINDOW2K
This problem occurs because the Hhctrl.ocx version number is wrong or is not registered correctly. The reason is that other installed software replaced the original version with the old version of Hhctrl.ocx.
IE6SP1, this file should have a version number of 5.2.3735.0. You can look at the version number of this file for your system.
Located in the Winnt/system32 folder. Size 504K (English version) copy a copy from the same system (ie version is the same)
Paste into the appropriate folder in your system. Then sign up.

Attention:
1. Replace this file with the Winnt/system32/dllcache folder first
After replacing this file in the Winnt/system32 folder
2, if you do not see this file,
First Tool – Folder option, set Show hidden file
and set the display system file
3, the method of registration is
Start – Run, enter regsvr32 hhctrl.ocx
Then come out with a registered successful dialog, OK and then reboot the system.