Piece 'o cake. Render. Save as a MacIntosh .PICT image file (be sure image resolution is square, i.e., 300X300). Open Image in Photoshop and INVERT the alpha channel. (Actually, any paint program that allows you to manipulate the alpha channel will work.) Click the (first) color channel. In the paint program, resize the image to 91X91 pixels and save. Download and install "RSR Converter." Run RSR Converter. Open the PICT file in the first box and specify the .rsr file (and path) in the second box (.rsr file should have exact same name as the .cr2). Save. Warning: the Mac Poser version CANNOT "read" the .rsr file, but it's there. Bundle the .rsr with the .cr2 file and it's now PC ready. I do it alla time.