>>>Yes, i am using from this method for many years. but now i have a loader for main program.
>>>I have MainApp.exe and Main001.exe, Main002.exe, Main003.exe in one share folder. when user run the MainApp.exe, this run Main003.exe ( as bigger Main???.exe in folder ) this is for program upgrading. but now i lose locked users! i dont know why. so i want to find another way if possible.
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>>Locks should not be released just because you execute another exe unless you are calling out to it and terminating the calling exe.
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>But then the locking should be done by the main.exe, not the loader.

EXACTLY, and my problem start from here. I must lock active user and must have update capability. and i dont want to put locker procedure in loader.