I am afraid you’ll have to ask your friend about the way he keeps the SW files, better yet - to save you a copy of SLDASM in the same directory as SLDPRT-files.
Hi Niels- That seems like it ought to work, with the part files in the same folder as the assembly - any chance you can share the files with us via www.rhino3d.com/upload?
Hi Niels - it looks like maybe there are other sldasm files, sub-assembly files, expected as well, between the top level and the sldprt file you sent- is that possible?