Preview and .dng issues

I've just converted ~1000 .crw files (from a Canon S45) to dng (using DNG Converter) and Preview posts an error when I try opening a converted dng:
"Couldn’t open the file. It may be corrupt or a file format that Preview doesn’t recognize."
In contrast Photoshop and iView Media Pro opens these converted DNG's without issue.
IS this a problem with Preview.app or the converted DNG files? I thought DNG was supposed to solve issues like this...
PowerMac G4 Dual 500   Mac OS X (10.4)  

Thanks Terence for the replies. I've searched and read and can find no evidence that QT would ever be able to open a RAW file. In fact, when Apple releases support for new RAW files they update the OS, not the QT frameworks.
Then the answer is, if it's openable with QT, then it is. If QT cannot open it, then Preview can't.
I just tested this with my CR2 files--which come from a Canon 350D (Digital Rebel). QT can not open the CR2 file but Preview can.
I read on another board that the CRW files from my Canon S45 dont conform to some specification. I would assume the result of non-conformance means that these files cant be translated to DNG (and opened in Preview).
Of course if anyone else has any ideas I'd appreciate your input

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