I have a copy of Autosketch 5. It is the only copy I have owned. Still .skf files that I created in 2004, 5, 6 & 7 are not readable today. Can anyone tell me if that makes sense? Could I have installed a upgrade that doesn't show that would have done that? I keep getting this error: "Unsupported CAD file version (402)" When I try to open them I get "Older file version, no preview available" on even files that were created in 2008. Please help