I have this assembly that was sent to us from a vendor and it's so detailed and huge that it will eventually crash any assembly it's brought into. I would attach it to this thread but it came to us as a STEP file and is too large to include here (even if it is zipped). For some reason, the vendor is not able to reduce the level of detail.

I can import this STEP file as and assembly and then save it as a part file (telling it to save only external faces). This will reduce the overall file size significantly but the apparent level of detail still causes problems.

Is there anything I can do to further reduce the file size?