Your old software does not understand the new file format. ACR needs to be upgraded. I am not sure if the version of ACR with Lightroom 2.x got the new update or just the version with LR 3.x.Edit: A quick check at the Adobe forums suggests that you will probably need to upgrade to Lightroom 3.---------+---------+---------+---------+Joseph KSeattle, WA, USAD200, 17-55mm f/2.8 DX, 70-200mm f/2.8 VR, 50mm f/1.4 D18-70mm f/3.5-4.5 DX, 70-300mm f/4-5.6 ED, D70S
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