Hi Cindy, Yes, in order to validate kes arc or wyn files, you need the proprietary software that creates those file types: e.g. K1000 or K3000 create kes files; Openbook creats Arc files, and I'm not sure if it also deals with wyn files or not. And wyn, not sure if that's the proper spelling, its the FS compeditor to K3000, creates wyn files. mary