You need to use PPENG (ProntoProEdit NG). Download it either from this site or the Philips site. It will read your 3000 pcf directly, convert it to 7000 format, and allow you to upload it to the 7000. All the IR codes should work fine, but you may have to fiddle with transparency. Converting the gray-scale 3000 images to color images isn't absolutely necessary but will certainly enhance the appearance, and can be done with a graphics editing program (e.g., Paint Shop Pro).

Edit: OOPS. Lyndel beat me to it. I was still typing my reply when he posted his.