Pretty Office Icon Set Part 10 which rendered at 512×512, 256×256, 128×128, 64×64, 48×48, 32×32, 16×16 pixels and format are png, ico and icns. This set provides 3 styles (simple, shadow and reflection) to choose.
download here: http://www.customicondesign.com/free-icons/pretty-office-icon-set/pretty-office-icon-set-part-10/