Fixed property usage in file channel.
Fixed property usage in file channel.

20080718121656-8ed0e-c2a8e962f568aa10f7649e5df68511dadd29201c.gz

freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut