Brother MFC-640CW - Manual (Page 137)

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To change the destination application, choose the proper application from the Target Application pop-up
menu. You can add an application to the lists by clicking the Add button.
Enter the Application Name (up to 30 characters) and choose your preferred application by clicking the
Browse button. Also choose the File Type from the pop-up menu.
You can delete an application that you have added. Just choose the Application Name and click the Delete
button.
Note
This function is also available for Scan to E-mail and Scan to OCR. The window may vary depending on
the function.