How do I get Preview to recognise DNG files?

My iMac intel core duo 2 has stopped recognising DNG files. I have just updated to OS X 10.7.5 from 10.6 but when I try to open a DNG file I get a message saying 'Preview does not currently support this raw format'. This time the system is creating thumbnails, whereas before I updated the OS DNG files showed as empty (0x0 kb) but it still won't open them.

Have you been using a DNG file converter before opening the files in Preview first?

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