Hello Hansmex,
First of all greatest thanks for your reply....
When I downloaded the 3D Model there was only one file (I downloaded them form the link you gave us, there are very nice models, Models By IKEA) where I can find the downloaded model textures?
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When I put a texture as floor it is displayed very strangely, please check it
http://dl.dropbox.com/u/6200480/Floor_texture.png

Thank you in Advanced