Why image size nb of colors are wrong in Worksheet ?

When I open an image in ColorThink Pro Worksheet, it shows wrong size and wrong number of unique colors.

For instance, when I open the RGB16Million.tif image from Bruce Lindloom web site (4096x4096 pixels image) ColorThink Pro shows an 500x500 pixels image (instead of 4096x4096) with 209903 unique colors (instead of 16 millions). Why ?