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Problem: Can’t open downloaded CHMs from the web.
Warning: 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:
Method 1
Method 2
Microsoft, HTMLHelp, CHM, security fixes, workaround