What if PHP's CHM manual doesn't open?

PHP's CHM manual, which is downloaded on the web, is often not open, nor does it happen every time. Here are the solutions and the reasons that are found.

If you are prompted to open or save a. chm file from a Web site, do so only if you need this file and trust the Web site that provides the file.

In the File Download dialog box, click Save, and then select the location where you want to save the. chm file. Then, use one of the following methods:

Method 1

1. Double-click the. chm file.

2. In the Open File Security Warning dialog box, click to clear the Always ask before opening this file check box.

3. Click Open.

Method 2

1. Right-click the CHM file, and then click Properties.

2. Click Unblock.

3. Double-click the. chm file to open this file.

Refer to Microsoft's Note: HTTP://SUPPORT.MICROSOFT.COM/KB/902225/ZH-CN