No, it'll be located in GETENV(SystemRoot) + "\System32", for example C:\WINDOWS\SYSTEM32\CONFIG.NT. You cannot assume that SystemRoot'll be always C:\Windows because it can be changed during Windows installation or as result of upgrading to WinXP.

>Hi Sergey,
>
>Thanks for this one.
>
>Does that mean that CONFIG.NT would then be located directly
>in C:\WINDOWS\CONFIG.NT ?
>
>But if in some case the user is not allowed to change this file, my program will not be allowed to change anything too. Right?
>I hope FOPEN can detect this situation correctly.
>
>Thanks again.
>