>>>>> "Pierre" == Pierre Muller writes: Pierre> I found NO info on the microsoft site about the content of this array... Pierre> the only thing I found was that it is CPU specific, so Pierre> this might still fail for non intel processors.... Maybe you would want to look at "IA-32 Intel ® Architecture Software Developer's Manual Volume 2 : Instruction Set Reference", FXSAVE insn. Regards, -velco