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I'm trying to recover some .3dm Rhino 3D model files. I ran a hexdump on a sample, which returns

00000000- 33 44 20 47 65 6F 6D 65 74 72 79 20 46 69 6C 65 [3D Geometry File]
00000001- 20 46 6F 72 6D 61 74 20 20 20 20 20 20 20 20 33 [ Format 3]

I have therefore created a photorec.sig file in the ...