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Home > Knowledge Base > Help file shows 404 or action cancelled (KBID# 30)

I.T. Mate Knowledge Base - KBID# 30

Help file shows 404 or action cancelled (KBID# 30)


When trying to view an HTML Help (CHM) file;

An Action Cancelled error appears


A Page Not Found error appears


There are several possible reasons for this occuring.

1. The HTMLHelp control is not present or not correctly registered
2. The help file is blocked
3. The help file has a read only attribute enabled
4. The path to the help file contains a hash (#)
5. The help file has become corrupted


To check register the HTMLHelp control:
1. Go to Start > Run
2. In the box, type: regsvr32 hhctrl.ocx
3. Press return or click OK

If you do not see a DllRegisterSucceeded message, you will need to ensure the file is present on your computer.
To check the file is not blocked:
1. Right click the help file and select "Properties"
2. Mark the "Unblock" option
3. Click Apply > OK

If you do not see it, do not worry, the lack of this option means the file is already unblocked.
To check the file is not marked as read only:
1. Right click the file and select "Properties"
2. Untick the option labelled "Read Only"
3. Click Apply > OK
To check the path for a hash (#)
1. Right click the file and select "Properties"
2. Look for the property labelled "Location" and check there are no hash characters

The presence of this character in the path is known to cause confusion as to where the file should look.
To verify the help file has/has not become corrupted
1. Download and run a fresh copy of the help file from the products download page

Additional Information



Download and run the HTML Diagnostics tool

The information in this article applies to:
  1. CHM (HTMLHelp) help files
  2. Microsoft Windows XP Service Pack 2
Published: 06/10/2005 16:01:42
Updated: 20/09/2007 00:55:40

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