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dencorso

HIMEM.SYS exists in XP and in 2k... Why?

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Some time ago I found out there is a version of HIMEM.SYS (4896 bytes 08/04/04 07:00pm) in Win XP, and that another one is to be found in Win 2k (4768 bytes 09/25/99 1:08am) also. Both claim to be Version 2.77 (of 02/27/91), which, of course, they are not. I bet there's one in NT too, but I have no way to check that. Since, AFAIK, the NT family of Windows OSes doesn't need HIMEM.SYS, I now ask you all, why is that so? Can anyone enlighten me, please? Thanks a lot!

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While I can't give you any answer, it brough me such sweet memories :)

I should get some old PC with DOS and Norton Commander just for the hell if it :D

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NOT an answer, but something to think about. :unsure:

While playing with this thingy here:

http://www.boot-land.net/forums/?showtopic=3717

(which might be of interest to you anyway)

I found out that the files in \System32 needed to run this Registry Viewer:

http://paullee.ru/regstry

Are these ones:

 Directory di W:\XPCL10M\Addons\rv\System32

08/01/2008 21.17 <DIR> .
08/01/2008 21.17 <DIR> ..
17/08/2001 23.36 370.688 aclayers.dll
17/08/2001 14.32 50.620 command.com
17/08/2001 14.31 27.097 country.sys
17/08/2001 14.37 53.840 dosx.exe
21/07/2001 15.40 127.213 ega.cpi
17/08/2001 14.31 4.768 himem.sys
17/08/2001 14.32 14.710 kb16.com
17/08/2001 14.31 42.537 keyboard.sys
17/08/2001 14.35 817 mscdexnt.exe
17/08/2001 14.31 27.866 ntdos.sys
17/08/2001 14.31 33.808 ntio.sys
17/08/2001 23.36 395.776 ntvdm.exe
17/08/2001 14.32 3.338 redir.exe
17/08/2001 23.36 39.936 rtutils.dll
14 File 1.193.014 byte

(files are from XP SP0)

So it seems like there is an entire "NT-DOS" subsystem :blink: buried inside XP, it should be the so-called NTVDM:

http://support.microsoft.com/kb/314106/en-us

I have made not further invstigations on this, but maybe it can be a start point for you.

jaclaz

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Just a guess but maybe it's used when installing XP and/or repairing from Recovery console?

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