CHM is an HTML help file for online helps. It is proprietary format from Microsoft. In CHM file a number of HTML help files are compressed, compiled and indexed. CHM files are used mostly as software manual. LZX compression technique is used to compress files in CHM format. There is a search option in this file.
You are trying to open a CHM file but get a message like 'Navigation to the webpage was canceled' or 'This program cannot display the webpage' instead of the topic content. Here are the reasons why that can happen:
- CHM Viewer Star is a specialized application for reading CHM files. By using it, you will be able to read CHM files conveniently, zoom the text, go back and forward, add bookmarks, modify the text encoding, and print the currently viewing topic. Also, you can search in the file and use Command+F to find something in the current viewing page.
- ChmPlus Reader (CHM+ Reader) is a feature-rich CHM (Microsoft Compiled HTML Help) document / ebook reader for iPad, iPhone and iPod touch. ChmPlus Reader is currently the best CHM reader available for iOS. ChmPlus Reader now supports highlight / annotation, bookmark and search (find on page & document-wide search).
- XCHM is a cross-platform GUI front-end to chmlib, with borrowed bits from Pabs' chmdeco project. Originally written for UNIX systems (Linux,.BSD, Solaris), xCHM has been since ported to Mac OS X and Windows. XCHM can show the content tree if one is available, print pages, change font face and size, remember bookmarks.
1. HTML Help (CHM) Viewer Component Is Not Registered
Type in the following to your command prompt: 'regsvr32 hhctrl.ocx'. After getting the success message like 'DllRegisterServer in hhctrl.ocx succeeded', try to open your CHM file again.
2. Your CHM File Has the '#' Hash Character in the Filename or in the Directory Name.
Chm Reader Mac
Hash (#) is a registered character which is used for hyperlinks. This character can not be used (as well as '?','&' and '+' characters. All those have special meaning. Try to remove all hashes and other special characters from the file and directory name.
3. Your CHM is Blocked by Windows Security Policy
Chm Reader Chrome
Since CHM consists of compiled HTML files, it can contain harmful scripts. That is why Windows security updates may block its content.
To unblock a trusted CHM file:
- Right click your CHM file and select 'Properties' on the popup menu.
- On the 'General' tab, click the 'Unblock' button.
- Then click 'OK'.
4. Your CHM File is in a Restricted Internet Zone
Your CHM file may be located on a network computer, network drive, that exists in a restricted zone. The problem can also occur if you are trying to run it directly from an unknown website.
You can simply copy the CHM file to your local hard drive. Alternatively, you can modify the ItssRestrictions settings in the Windows Registry.
To do so:
Chm Reader Chrome
- Run Regedit.
- Open or create (if it does not exists) the key: HKLMSoftwareMicrosoftHTMLHelp1.xItssRestrictions.
- Add a new DWORD subkey named MaxAllowedZone and set one of the following values there: 0 - My Computer, 1 - Local Intranet, 2 - Trusted Sites, 3 - Internet Zone, 4 - Restricted Zone.