By "very old .daz files," how would you define that? How old is too old? I have .daz format files going back to late 2011 or early 2012 through early July of '14. They were all created & saved with DS 4.03+. All were with V4.2, no previous generations. I do know that everything created & saved from at least last year and most of '13 had been working fine up until the Hdd failure.