1. #1
    Unregistered

    Cannot open CHM files on Windows 7

    Every time, I try to open CHM files through my PC running on Windows 7, I am getting the error message “Navigation to the webpage was canceled”. I have rebooted the PC and it does not resolve the issue. What has to be done for removing this error message?



  2. #2
    expert Array
    Join Date
    May 2012
    Posts
    1,791

    Re: Cannot open CHM files on Windows 7

    Press the ‘Start’ button and enter cmd into the search box appears on the start menu. Right click on the command prompt until a set of options can be seen on the screen. Select ‘Run as administrator’ option from that list and type regsvr32 hhctrl.ocx into the command prompt. If this does not help, then right click on the CHM file you want to open and choose ‘Properties’ from the available list. Once you get into the ‘Properties’ dialog box, press the ‘General’ tab and click on the ‘Unlock’ button. This button resides under ‘Security’ label in the bottom part of the screen. Click on ‘Apply’ and ‘OK’ button for saving the changes made to the settings.

  3. #3
    mohan123 Array
    Join Date
    Oct 2012
    Posts
    433

    Re: Cannot open CHM files on Windows 7

    Dear friends.

    Press windows key+R,

    Type in run "regedit" then click ok.Locate and follow sub link.

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x \ItssRestrictions.


    Right click the ItssRestrictions subley, point to New, and then click DWORD value.


    Type MaxAllowedZone, and then press Enter.

    Right click the MaxAllowedZone value, and then click modify.


    In the Value data box,type 1, and then click OK.


    Quite registry editor.

    I hope it will help you

    Thank you and All the best..

  4. #4
    gauravgpt Array
    Join Date
    Jul 2012
    Posts
    853

    Re: Cannot open CHM files on Windows 7



    Hello friend...

    The security patch and its effects are fully described on Microsoft's web site at http://support.microsoft.com/kb/896358

    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:

    1. Click Start, click Run, type regedit, and then click OK.
    2. Locate and then click the following subkey:
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x \ItssRestrictions
    If this registry subkey does not exist, 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 1, and then click OK.
    7. Quit Registry Editor.

    If this solution does not work for you, please see http://support.microsoft.com/kb/896358 for alternatives.



    All the best!!

  5. #5
    heemanshubhalla Array
    Join Date
    Sep 2012
    Location
    India
    Posts
    570

    Re: Cannot open CHM files on Windows 7

    I have found that you do not need any software to view the file. These files coming from third party server are by default blocked. Hence you just need to unblock them in many instances to view them.

    1. Right click the file and select 'Properties'
    2. Click Unblock


    When the .chm file is on other network drive:

    1. Go to Run and type regedit
    2. Locate HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x \ItssRestrictions. Create the registry key, if it does not exist
    3. Right-click ItssRestrictions, select New, and then click DWORD.
    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.
    0 = My Computer
    1 = Local Intranet Zone
    2 = Trusted sites Zone
    3 = Internet Zone
    4 = Restricted Sites Zone


  6. #6
    ak47 Array
    Join Date
    Jan 2013
    Posts
    493

    Re: Cannot open CHM files on Windows 7

    . Click Start, click Run, type regedit, and then click OK.
    2. Locate and then click the following subkey:
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x \ItssRestrictions
    If this registry subkey does not exist, 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 1, and then click OK.
    7. Quit Registry Editor.

  7. #7
    sumitnath Array
    Join Date
    Jan 2013
    Posts
    394

    Re: Cannot open CHM files on Windows 7

    Re: Cannot open CHM files on Windows 7

    Hi friends,,

    you cannot open CHM files on windows 7-----

    follow the steps-----

    ===Right click the file
    ===select 'Properties'
    ===Click Unblock


    When the CHM file is on other network drive:======

    1ST==Go to Run and type regedit
    2ND==Locate HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x \ItssRestrictions. Create the registry key, if it does not exist
    3RD==Right-click ItssRestrictions, select New, and then click DWORD.
    4TH==Type MaxAllowedZone, and then press ENTER.
    5TH==Right-click the MaxAllowedZone value, and then click Modify.
    6TH==In the Value data box, type a number from 0 and 4, and then click OK.

    0 ==My Computer
    1== Local Intranet Zone
    2==Trusted sites Zone
    3 ==Internet Zone
    4 ==Restricted Sites Zone

  8. #8
    ghanathey swetha Array
    Join Date
    Nov 2012
    Posts
    509

    Re: Cannot open CHM files on Windows 7

    Hi.
    Follow the below steps:
    >Click Start, click Run, type regedit, and then click OK. >Locate and then click the following sub key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x \ItssRestrictions >If this registry subkey does not exist, create it. >Right-click the ItssRestrictions subkey, point to New, and then click DWORD Value. >Type MaxAllowedZone, and then press Enter. >Right-click the MaxAllowedZone value, and then click Modify. >In the Value data box, type 1, and then click OK. >Exit Registry Editor.

    thank you.

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