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Articles : Error Accessing and Displaying CHM Files |
Error Accessing and Displaying CHM Files: Reasons and SolutionsBy Dennis Crane
So, you've got in trouble. Some or even all of your CHM files
seem to have gotten corrupted. They show a "The page cannot be
displayed" error in the left-hand pane of the CHM viewer.
There are several possible reasons why your CHM e-books and
documentation files are unreadable.
A security update for Windows XP® may block access to CHM files Windows XP® security update blocks active content in CHM files to protect your system security. Additional information is available here. Solution: Run Windows Explorer, right-click on the CHM file, and select Properties from the popup menu. Click on the Unblock button immediately below the Advanced button on the General page. Click Apply to show the content. Once the CHM file has been unblocked, the Unblock button disappears. The CHM file is in the restricted Internet zone When a CHM file that you are trying to access is stored remotely, e.g. on the network drive or on a remote server, you may also get in trouble. If the associated security zone is restricted, then CHM files won't be displayed as well. Solution: Modify the ItssRestrictions registry entry to enable a specific security zone. Follow these steps: 1. Run 'regedit' command from the command line. 2. Locate and then click the following subkey: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\ItssRestrictions Note: If this registry subkey does not exist, then create it. 3. Right-click the ItssRestrictions subkey, point to New, and then click DWORD Value. 4. Type MaxAllowedZone, and then press ENTER. 5. Right-click the MaxAllowedZone value, and then click Modify. 6. In the Value data box, type a number from 0 and 4, and then click OK. The values settings are 0 = My Computer 1 = Local Intranet Zone 2 = Trusted sites Zone 3 = Internet Zone 4 = Restricted Sites Zone For 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. 7. Quit Registry Editor. Warning Enable only those security zones that you trust. Do not enable security zones about which you are not sure. Dennis Crane, the author of Dr. Explain software, specializes in vertical markets software development. He is online at http://www.drexplain.com Article Source: http://drexplain.com
You are permitted to reprint this text as long as it
includes copyright notice and link to our web site.
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January 20, 2010
"Dr Explain made generating the help files a pleasure rather than a chore."