LES AX,SP and Windows NT DOS emulator

Hi all !

A long time ago I had seen that the following instruction
[code]les ax,sp[/code]
had a strange effect on Windows NT's DOS emulator.
I think it was the same with other instructions having C4C4h as opcode.

I cannot remember all the details and can't find anything on the Web (except on some Russian sites but I don't understand anything !).

Could someone tell me something about it ?


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