I shall continue in English then, bit more fluent in that language.
I've continued with experimenting with getting nice floor reflections and this is what i got till now:
The good: at least i can see the reflection of the sky outside on the floor.
The bad: the reflection doesn't look convincing to my eyes.
I've used the blue channel from the diffuse bitmap as a reflection color map with Reflectivity on 0,75, Glossiness on 0,6 and 32 samples.
Also i have used a jpg with a brightened black/white grunge texture as a reflection color map but that made the reflection too white, even after adjusting the settings.
Maybe someone can tell me what i'm doing wrong, I'm still relatively new to max.
Thanks und danke in advance!