I don't see why it can't be done with a Dreambox, though I'm not aware of any Netflix client for them. You would therefore need a media server running on another PC. Playon is good, though there are many others with various degrees of functionality (eg; plex, mediatomb, etc). You then need a upnp/dlna client for the dreambox. I haven't tried this, but djmount features in this post:
You should then be able to access Netflix and other sources via UPNP.
Good luck.
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