- Topics in the .chm file cannot be viewed when you click Open instead of Save in the File Download dialog box.
- Topics in the .chm file cannot be viewed when you click Save in the File Download dialog box, and you then try to open the file.
Resolution for end usersWarning If you are prompted to open or to save a .chm file from a Web site, you should do so only if you need the file and if you trust the Web site that is providing the file.
In the File Download dialog box, click Save, and then choose where you want to save the .chm file. Then, use one of the following methods:
- Double-click the .chm file.
- In the Open File-Security Warning dialog box, click to clear the Always ask before opening this file check box.
- Click Open.
- Right-click the CHM file, and then click Properties.
- Click Unblock.
- Double-click the .chm file to open the file.
Resolution for system administratorsTo resolve this issue, use one of the following methods.
Use UNC file paths and file shares to link to .chm filesIf your intranet Web page uses the HTTP URL scheme to link to .chm files, security update 896358 may prevent users from seeing topics in the .chm file. Replacing an HTTP file path with a UNC file path can make it possible again to open .chm files from the Web page.
To use a UNC file path instead of an HTTP URL, follow these steps:
- Put the .chm files on a file share server that can be addressed by using a UNC file path.
A UNC file path looks similar to the following path:\\productmanuals\helpfiles
- Use the ItssRestrictions\UrlAllowList value to enable the systems in your intranet to access the .chm files from that file share.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:896054 You cannot open remote content by using the InfoTech protocol after you install security update 896358, security update 840315, or Windows Server 2003 Service Pack 1
- Update the links on your intranet Web page to use UNC file paths in the URLs that link to the .chm files.
Set up Web applications to download .chm filesOn the Web page that links to .chm files, add instructions that advise the user to save the file instead of opening the file directly. For more information, see the "Resolution for end users" section.
You can also use the DownloadOptions <META> tag to remove the Open button from the File Download dialog box that appears after a user clicks a link to the .chm file. Put this tag inside the <head> tag of your HTML page. This usage is illustrated in the following example.
<META name="DownloadOptions" content="noopen">
Overview and examples for system administratorsFor more information about security update 896358 and how you can re-enable Web applications that are affected by this update, click the following article number to view the article in the Microsoft Knowledge Base:
Internet ExplorerFor more information about opening files by hyperlink in Internet Explorer, click the following article number to view the article in the Microsoft Knowledge Base:
Technical support for x64-based versions of Microsoft WindowsOn computers that are running x64-based versions of Microsoft Windows, you may have to adapt the instructions in the "Resolution" section about how to modify the registry. For example, you might have to modify a different part of the registry, depending on whether you want to modify the 32-bit or the 64-bit functionality. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
For product information about Microsoft Windows XP Professional x64 Edition, visit the following Microsoft Web site:
Article ID: 902225 - Last Review: Mar 29, 2017 - Revision: 2