Canon DR-2050SP - Manual (Page 46)

40 Using the Scanner
2.
Select [Scan] button from the [Scanner events] drop-down list.
3.
At [Send to this application] unmark the applications that are not to be started
up, and click [Apply].
4.
Click [OK] to close [CANON DR-2050C USB Properties].
5.
Restart Windows to enable the new settings for the event function.