Raw file previews of .rw2 files (in Finder, etc.) on Macintosh?

I know that this is not necessarily a Photoshop question, but it is the kind of issue that Photoshop users might be able to help me with.
I have two computers and two cameras. The computers are both Macs, the cameras are a Canon and Panasonic. For reasons that I don't understand, I can see image previews of the Canon raw files (.CR2) files in the Finder and other programs, but I can see previews of the Panasonic files (.RW2) files on only one computer. Both computers have Creative Suite Design Standard CS4 installed. I just updated Camera Raw by hand to v 5.7, but this didn't help.
I have talked to Apple Tech Support, they said that this was a user application issue--some application installs something that allows the Finder and other apps to display a preview of the image.
Browsing Apple's support forums, there is an indication that if I were to install iLife or Aperture, that might solve my problem (because there is a raw file updater for Mac that supports .RW2 files). But I don't have either program currently installed on either computer, and one can display previews.
Any thoughts on this? Anyone else able to see or not see previews of raw files.
TIA
PS--converting the .rw2 files to .dng does not help.

hello. did you ever find a solution to this problem? i still have this same problem with .rw2 riles not previewing in finder on one of my macs.
thanks. .j

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Raw file previews of .rw2 files (in Finder, etc.) on Macintosh?

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