Windows Portable Devices: Driver Development Guide

Note for Windows XP, Windows Vista, and Windows 7 users: By default, the functionality of this .chm extension file is blocked until you select Unblock in the properties field. To unblock the .chm file:

1. Make sure the .chm file is closed, and in Windows Explorer, right-click the .chm file, and click Properties.

2. To the right of the Security section, click Unblock.

3. Click OK, and then reopen the .chm file.

For more information about this error message, see the Why do I get "The Address Is Not Valid" when viewing the CHM? page at the .net Validation Framework Web site.