I assume your default programs have changed and you are using Win 7.
To change which programs Windows uses by default
To have the changes applied to all users:
Open Set Program Access and Computer Defaults by clicking the Start button , clicking Default Programs, and then clicking Set program access and computer defaults. If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
To specify the default programs for activities such as browsing the Internet and sending e?mail messages on your computer, choose one of the following configurations, expand the configuration and choose options (if available), and then click OK.
