Warning Enable only those security zones that you trust. In the Value data box, type a number from 0 and 4, and then click OK.įor most CHM files, the value of 1 should be enough to allow use without opening up access from/to remote CHM files in email/internet locations. 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. Note: If this registry subkey does not exist, then create it.ģ.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\ItssRestrictions Locate and then click the following subkey: Run 'regedit' command from the command line.Ģ. Solution: Modify the ItssRestrictions registry entry to enable a specific security zone.ġ. If the associated security zone is restricted, then CHM files won't be displayed as well. on the network drive or on a remote server, you may also get in trouble. When a CHM file that you are trying to access is stored remotely, e.g. The CHM file is in the restricted Internet zone Once the CHM file has been unblocked, the Unblock button disappears. Click on the Unblock button immediately below the Advanced button on the General page.
#Chm reader plugin windows
Solution: Run Windows Explorer, right-click on the CHM file, and select Properties from the popup menu. Additional information is available here.
#Chm reader plugin update
Windows XP® security update blocks active content in CHM files to protect your system security. Also avoid using '?', '&', and '+' characters in directory names.Ī security update for Windows XP® may block access to CHM files Solution: Remove the '#' (hash) character from the directory name. The hash character signifies an anchor in HTML so the CHM viewer fails to resolve the path properly and to retrieve the content. Many C# developers discovered that their documentation and e-books in CHM format cannot be read because they were storing their CHM files in the directories like 'C:\E-books\C#\' Your CHM files are stored in the folder with '#' (hash) character in the path Solution: Run "regsvr32 hhctrl.ocx" command from the command line to register the library in the system. The system file \system32\hhctrl.ocx may get missing, corrupted, or unregistered.
#Chm reader plugin Pc
The CHM viewer component is not properly registered on your PC There are several possible reasons why your CHM e-books and documentation files are unreadable. They show a "The page cannot be displayed" error in the left-hand pane of the CHM viewer. Some or even all of your CHM files seem to have gotten corrupted. Now you no longer have it, you need to reinstall that program. Before you reinstalled windows, you had the program that could read the file.
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