[Amittt]

Ok, look. when I import a .STL file it shows me a message:
"bla bla bla design1.stl is not a valid *.STL file"
This file was exported from autodesk pro desktop 8.0 in this way:
File --> export --> browse --> choosing the file --> save --> ok.
if you can help, pleaseeeee...

Ok, now I tried a diffrent file type: *.IGS
I exported it from pro desktop 8.0 in the same way and imported it in 3ds max.
A simple object like a square was imported perfectly to 3dsmax 8, but when I tried importing a complicated structure like a base of a robot (which was built from several other designs which were connected to one design) it didn't import nothing.
please, help.

Thanks a head, animation team, 1578.