Becker often works with iGO or Primo programs (rebuilded by or for Becker). Both iGO and Primo use maps (from Navteq/Here or TomTom/TeleAtlas) with the extension .fbl
However this one seems NOT to be an IGO/Primo based program since the maps and file structure isn't the same.
You could try this link:
[Please Register or Login to download file] or (mirror)
[Please Register or Login to download file] (Credits goto to Kor@l for the links)
Models supported :
A-Klasse / W 169 (09/04,<07/08)
A-Klasse / C 169 (11/04,<07/08)
B-Klasse / (06/05,<07/08)
C-Klasse / W 203 (04/04,<03/07)
C-Klasse / CL 203 (04/04,<03/07)
C-Klasse / S 203 (04/04,<03/07)
CLK-Klasse / A 209 (>06/04)
CLC-Klasse,<10/08)
M-Klasse / W 164 (>07/05,<07/08)
R-Klasse / W 251 (02/06,<07/08)
G-Klasse (> EZ 03/07,<09/08)
GL-Klasse / X 164 (<07/08)
Smart ForFour
Sprinter (> 01/06)(<11/09)
Vito/Viano (> 04/06)(<11/10)
No idea if and how these offered maps are suitable for you. Just trying to help.
Also it seems Audi uses the same maps