Maybe I'm going in the wrong direction . Here are some screen shots of the Encoders and Decoders available in Nero 6 from my Box.

But maybe it's a "Convertor" that's needed. The only one installed is the standard "Ahead RAW Audio Convertor" and maybe it can't handle the AC3 filter?? .

Or maybe it's only that the files are somehow copywright protected and I just can't see it . I wish I knew the answer to this puzzle