Paletted texture

I have in my demo (console application) a paletted texture
using the paletted texture extension. It works fine and no problem when loading the color LUT with glColorTableEXT function and defining the texture with the color index parameters. When using the same code in a windows application it doesn’t work properly. There are no errors returned by OpenGL but can’t see the texture rendered at all (I think it is a problem of loading the LUT).
Did I miss something? Do I have to make additional setup in windows? Can someone give me a reference to code sample using paletted texture?
Many thanks,