Ils en parlent ici :
http://support.microsoft.com/suppo [...] 8/9/30.ASP
Je te colle le petit texte d'où j'ai trouvé l'info
http://aumha.org/freeware.htm
NT/2K/XP. This Microsoft freeware utility provides ?on-the-fly? capability to replace files currenly in use by the operating system. Not only does this let your replace a single file instead of multiple files (as with a service pack), it helps in other areas, such as replacing protected files in Win XP (where Windows File Protection would otherwise turn around and undo your file replacement on the next boot). For further information on use, syntax, and recommended precautions, see MSKB Q228930.
Je suis sous Win98, je peux pas le tester.
Pierre.