How can I avoid, "Texture settings need to be corrected" message.

Hi,

When I import a FBX file into Unity, following message are shown. How can I avoid this?

"Texture settings need to be corrected for following textures."

Texture file is for normal mapping. And FBX file is Binary, texture-embedded. I can push "Fix Now" button, then get correct result, but this is annoying.

I did also check at other fbx files, like this --- http://fbx.clockstone.com/fbx-viewer-download.html

(Unity 3.5.5f3)

Thanks in advance.