Recovering a RAW file w/ 3 other files refuse to unpack

[KahL]

So after shooting a music video on the 50D, one scene spanned for more than 3min. or so, which lead to a .RAW chain of 3 files at 9.37GBs. However, for the life of me I cannot get the files to unpack. I've used Rawanizer, raw2dng and raw2cdng with no effect. The other files seem perfectly fine and they've all worked w/o a hit. But, this one actually contains a shot I would need, but cannot recover.

Is there any other way, or should I just cut my losses and leave well enough alone?