To view the CHM file one have to download the CHM file to the local computer to view it properly. Even if having downloaded the CHM file to the local computer, then one might experience a security warning when opening the CHM file. It is is possible to unblock file and avoid the warning.
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If in an environment where the computers (and the users) in the Intranet Zone can be trusted, then one configure the HTML Help viewer to allow viewing of CHM files placed on a local network drive. Create the following registry key: