I have a canon i-sensys MF635cx connected via USB. Printing and scanning with "MF Scan Utility" works.
Scanning from the printer to the computer does not work. On the PC a window opens with in the header "select the program to launch for this action" and empty content. Nothing to select.
On Devices & Printers, choosing the printers "Scan Properties" Events tab, the Actions - Start this Program shows "No applications are registered for this event".
What program/installation is needed, to get a registered application set/selectable ?