To take the question litterally, 'Deltas' are offsets for vertices. Thay are what Morph Targets are made out of. They look like this: d 0 -0.0001909994 6.002188e-005 0 d 1 -0.0002100002 5.704165e-005 0 d 2 -0.0001929998 6.002188e-005 0 d 3 -4.800037e-005 6.496906e-005 0 But for the purposes of your problem the above is irrelivent. As Ingrid says, it sounds like you have some missing files.