open RAW files in PS or Corel Photo

I store RAW pics from Canon G1 camera with Canon Zoombrowser into pc. Ones stored I cannot open them from HD with Photoshop nor CorelPhoto. Downloading straight from camera is no problem with Twain Driver. When I do “open as”and click the RAW optionand then the file, then a new window opens, asking for picture info like heighth, width, chanels, header. i choose h =2048, w = 1536, channels i choosed 1, 3 and 4,
header = 0. what shall I do to open the pics???