If you click Open without clearing the checkbox, the help file's table of contents will appear, but the body text will not.Īlternatively, in Windows Explorer, right-click the file that you want to open, click Properties, and then click Unblock. To resolve this problem, clear the "Always ask before opening this file" check box in the Open File-Security Warning dialog box, and then click Open. The security update may also prevent you from opening CHM files that you downloaded from the Internet, even if you saved them to your local hard disk. This is what is meant with "security updates to HTML Help" in KB4103718 and KB4103721. A further security patch rolled out for Windows 7 and later on has disabled this workaround.
This works on Windows XP and Windows Vista. In the Value data box, type 1, and then click OK. Right-click the MaxAllowedZone value, and then click Modify.Ħ. Type MaxAllowedZone, and then press Enter.ĥ. Right-click the ItssRestrictions subkey, point to New, and then click DWORD Value.Ĥ. If this registry subkey does not exist, create it.ģ. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\ItssRestrictions Locate and then click the following subkey: Click Start, click Run, type regedit, and then click OK.Ģ. If you trust all the computers on your LAN or intranet (and the people using them), you can lower the restrictions on the Local Intranet zone to allow CHM files to be displayed with the following steps:ġ. The security patch and its effects are fully described on Microsoft's web site at This restriction also affects Windows Vista and later, including Windows 10 and 11. The help file will appear, but instead of the topic text you will see an error message "this page cannot be displayed". Viewing CHM Files Across The Network Microsoft Security Update 896358īack in the days of Windows XP, Microsoft released a security patch that makes it impossible to view CHM files that are stored on a network drive (as opposed to CHM files stored on your own computer).
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