The most common problems can be solved by the following methods:
1: Right-click on chm to see if there is an unlock option. . Should be locked
Second: because the path name where the file is located contains characters such as #.
Symptoms After you
install security update 896358 or 890175, you may experience one or more of the following symptoms:
• Certain types of web-based programs may not function properly. For example, the table of contents in HTML Help may no longer work.
• Some HTML help functions may not work when opening .chm files from a remote location. For example, the "Related Topics" feature may not work.
The contents of the CHM are all invisible after opening...just like our common 404 errors!
Note: This article contains supplemental information to the following Microsoft Knowledge Base article:
896358 (http://support.microsoft.com/kb/896358/ ) MS05-026: Vulnerability in HTML Help Could Allow Remote Code
Execution 890175 (http://support.microsoft.com/kb/890175/) MS05-001: Vulnerability in HTML Help Could Allow Code Execution After
installing these security updates These symptoms are to be expected. This section provides some examples for administrators who must re-enable HTML Help ActiveX controls for business-critical programs. These alternatives can compromise your computer, making it more vulnerable to the threats suppressed by the above-mentioned security updates. The safest thing to do is not to use the registry workaround. If you must use an alternative method, set the registry value as strictly as possible.
Solution:
Paste the following text into a text editor such as Notepad. Then save the file with a .reg file extension and import it into the registry. (Be careful to back up the registry first).
CODE:[Copy to clipboard]REGEDIT4
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\HHRestrictions]
"UrlAllowList"="\\\\productmanuals\\helpfiles;http://www.wingtiptoys.com/help/"
In addition, Microsoft's own website has similar Instructions at http://support.microsoft.com/kb/902225/en-us
It gives a solution that references Solution
for end users
WARNING: If prompted to open or save a .chm file from a website, then Only do this if you need this file and trust the website that provides it.
In the File Download dialog box, click Save, and select the location where you want to save the .chm file. Then, use one of the following methods:
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.
3. Double-click the .chm file to open the file.
Reprinted source: http://hi.baidu.com/lihonghao_shzh/blog/item/b031dbd38aefc50b3bf3cf86.html