Hi Tom. If I remember correctly these aircraft were created with AD2000 & not the more usual FSDS1, FSDS2 or Gmax. In fact, Ickie was one of the few modellers to use this program successfully. Providing you're installing the files correctly I can't think why you're getting that error message or why the model won't display. I haven't seen problems reported with AD2000 aircraft & WinXP. The MDL Repair Utility is intended for MDL files animated with an early version of Aircraft Animator which is not used in AD2000.