不能打开远程帮助文件的解决办法

http://support.microsoft.com/kb/896054

Example 1: How to use UrlAllowList to enable specific URLs

Warning Include only URLs to sites that you trust completely.

The following .reg file re-enables use of the InfoTech protocol to open remote content from the following locations:

•	.chm files on \\productmanuals\helpfiles
•	A Web application at the following URL: http://www.wingtiptoys.com/help/

Note You can paste the following text in a text editor such as Notepad. Then, you can save the file that uses the .reg file name extension.

REGEDIT4
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\ItssRestrictions]
"UrlAllowList"="\\\\productmanuals\\helpfiles;file://\\\\productmanuals\\helpfiles;http://www.wingtiptoys.com/help/"

Note As you can see from the example, to enable a UNC path to a network shared folder, you must add the following two entries:

\\productmanuals\helpfiles\;file://\\productmanuals\helpfiles

You cannot use wildcard characters in the URL string of any site that is added to the UrlAllowList registry key. For example, the following string does not work:

"UrlAllowList"="http://*.wingtiptoys.com"

However, the following string works:

"UrlAllowList"="http://help.wingtiptoys.com"

This string lets the following sites serve content by using the InfoTech protocol:

•	http://help.wingtiptoys.com/research
•	http://help.wingtiptoys.com/sales

You still cannot access .chm files by using a URL. Although we do not recommend that you do this, you can access the files by following example 2 and setting the "MaxAllowedZone" to three or larger. This is because the .chm file uses the Internet Explorer cache and every page that comes from the cache uses the Internet zone. Therefore, we highly recommend that you use the UNC path to access the Help files as previously described.