David Nield is a technology journalist from Manchester in the U.K. who has been writing about gadgets and apps for more than 20 years. He has a bachelor's degree in English Literature from Durham ...

What steps do I need to take to change the default action on Windows XP and Windows 7 when someone tries to open a CHM file? I want the file extension to be associated with notepad.exe for ALL users.

Adam Benjamin has helped people navigate complex problems for the past decade. The former digital services editor for Reviews.com, Adam now leads CNET's services and software team and contributes to ...