Convert nrw to jpeg

Hi, I have a Nokia x2 00 which saves images taken with its camera in nrw format and then keeps on processing then to jpeg's in background. The problem is that due to this processing, after clicking 24 photos continusly, the camera becomes really slow, so slow that that it takes 34 s between two clicks. So, when I copy those nrw's before the phone processes them to my pc, I just cant open them. Photoshop cs6 says theses an error, another image converter converts but the resulting jpeg is just complete grey.Does anyone know a way to convert those nokia nrw's to jpeg?
 
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