supporting film - der Vorfilm is from Langenscheidt M-S 2004. I'm not sure if it is exactly the same thing, but it seems very close, and I've never heard of "programme picture" and couldn't find any Google hits for it in this context.
"These were also the days of the Double Feature and the supporting film was
often a much older one than the main feature" http://widescreenmovies.org/WSM02/dvd2.htm
Vor|film, der; -[e]s, -e:
im Kino vor dem Hauptfilm laufender [Kurz]film.
Quelle: DUDEN - Deutsches Universalwörterbuch
Oxford Dict. of Eng: *supporting* (of a pop or rock group or performer) function as a secondary act to (another) at a concert
*B-movie* - a low-budget film of inferior quality made for use as a supporting feature in a cinema programme
("programme picture" is not in the Oxford Dict. of Eng.)