Brother MFC-3420C - Manual (Page 60)

3 - 3 USING THE BROTHER CONTROL CENTER
Brother Control Center features
Auto Configuration
During installation the Control Center will check your system to set
up the default applications for E-mail, word processing and the
graphics viewer/editor.
For example, if you are using Outlook as your default E-mail
application, the Control Center will create a link and a scanning
application button for Outlook.
You can change a default application. Right-click the appropriate
Control Center button to display Configurations and then click it.
Select a different application.
For example, you can change a scan button from MS Word Pad
to MS Word by changing the application
that is listed for the Word Processor.