I have an old assembly that I made with SW2000, but I just installed SW2003 SP0 and now It seems that it can't open or create any assembly, the assembly template is gone, a message pops up tellingme that the system can't recognize this file/format. I've reinstalled this version almost twice but always is the same, I can edit only parts, not assembly... Any insight on what's going on would be appreciated. I've a P4 512MB ram with Windows XP professional Cheers -gabriel