Hello All, Has anyone had problems with lost file references when going from a P3 to P4 machine on very large assemblies please? We have an assembly which works fine on Athlon 1700, P3 1Ghz (dual) etc. But when opened on the P4 it looks for hundreds of files that either ARE there and lots that are no longer in the assembly. We have used Save as with references, Find references, converter wizard all to no avail. Any help would be very appreciated