Hello michaa7,
you can find out which package contains any given file with apt-file (needs # apt-file update", e.g. with cron):
$ apt-file search gdk-pixbuf-query-loaders
libgdk-pixbuf2.0-0: /usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/gdk-pixbuf-query-loaders
This result is from an amd64 architecture. You will have to use a different path.
greetings
musca