How to View CHM Files in Windows 7

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Microsoft by default includes a security patch to block CHM files on network drives or comes from other computers in Windows, these Compiled Help files can contain scripts that can harm your Computer, hence you can’t view any help topics or CHM Viewer won’t display any, here is how to fix this error.

1.. Right click on the CHM file you’ve saved earlier, select “Properties” on the General tab and click “Unblock” button.
(You may need to run as an Administrator account to see the unblock item).

用滑鼠右鍵按一下 CHM 檔案，然後按一下 [內容]。

按一下 [解除封鎖]。

按兩下 .chm 檔案以開啟檔案。

2. Sometimes unregistered HTML Help viewer component can also cause this problem, try to register it by running the command in command prompt “regsvr32 hhctrl.ocx”.

Guideline to repair this issue
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1. Go to C:\Documents and Settings\enlim\Application Data\Microsoft\HTML Help on the computer
2. Delete the hh.dat
3. Go to command prompt type in unregsvr32 c:\windows\system32\hhctrl.ocx
4. Then later register the file regsvr32 c:\windows\system32\hhctrl.ocx
5. Retry to launch any of the Help Files, it should be able to load

3.Others method.

1.直接去下載免費的7-zip，將整個chm解壓縮成為一般的html檔案
2.找chm reader
3.用CHM Converter將chm檔轉成html或是pdf就可以了。

3.