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Unlocking WinXP's setupp.ini

WinXP's setupp.ini controls how the CD acts.
is it an OEM version or retail?
First, find your setupp.ini file in the i386 directory on your WinXP CD. Open it up, it'll look something like this:

ExtraData=707A667567736F696F697911AE7E05
Pid=55034000

The Pid value is what we're interested in.
What's there now looks like a standard default.
There are special numbers that determine if it's a retail, oem, or volume license edition.
First we break down that number into two parts.
The first five digits determines how the CD will behave,
ie is it a retail cd that lets you clean install or upgrade,
or an oem cd that only lets you perform a clean install?
The last three digits determines what CD key it will accept.
You are able to mix and match these values.
For example you could make a WinXP cd that acted like a retail cd, yet accepted OEM keys.

Now, for the actual values.
Remember the first and last values are interchangable,
but usually you'd keep them as a pair:

Retail = 51882335
Volume License = 51883 270
OEM = 82503 OEM

So if you wanted a retail CD that took retail keys,
the last line of your setupp.ini file would read:

Pid=51882335

And if you wanted a retail CD that took OEM keys, you'd use:

Pid=51882OEM

Here's a list of all the various types of disc along with the volume name, date and PID numbers: Windows XP Home Retail = WXHFPP_EN 08/23/01 8:00 AM (08:00:00) 55277000 Windows XP Home Retail w/ SP1 = XRMHFPP_EN 08/29/02 8:00 AM (08:00:00) 55277000 Windows XP Home Retail w/ SP1a = X1AHFPP_EN 03/31/03 8:00 AM (08:00:00) 55277000 Windows XP Home Retail w/ SP2 = VRMHFPP_EN 08/04/04 8:00 AM (08:00:00) 55277000 Windows XP Home Upgrade = WXHCCP_EN 08/23/01 8:00 AM (08:00:00) 55285000 Windows XP Home Upgrade W/SP1 = XRMHCCP_EN 08/29/02 8:00 AM (08:00:00) 55285000 Windows XP Home Upgrade W/SP1a = X1AHCCP_EN 03/31/03 8:00 AM (08:00:00) 55285000 Windows XP Home Upgrade W/SP2 = VRMHCCP_EN 08/04/04 8:00 AM (08:00:00) 55285000 Windows XP Home OEM = WXHOEM_EN 08/23/01 8:00 AM (08:00:00) 55277OEM Windows XP Home OEM w/ SP1 = XRMHOEM_EN 08/29/02 8:00 AM (08:00:00) 55277OEM Windows XP Home OEM w/ SP1a = X1AHOEM_EN 03/31/03 8:00 AM (08:00:00) 55277OEM Windows XP Home OEM w/ SP2 = VRMHOEM_EN 08/04/04 8:00 AM (08:00:00) 55277OEM Windows XP Home Volume = WXHVOL_EN 08/23/01 8:00 AM (08:00:00) 55274270 Windows XP Home Volume W/ SP1 = XRMHVOL_EN 08/29/02 8:00 AM (08:00:00) 55274270 Windows XP Home Volume W/ SP1a = X1AHVOL_EN 03/31/03 8:00 AM (08:00:00) 55274270 Windows XP Home Volume W/ SP2 = VRMHVOL_EN 08/04/04 8:00 AM (08:00:00) 55274270 Windows XP Pro Retail = WXPFPP_EN 08/23/01 8:00 AM (08:00:00) 55274000 Windows XP Pro Retail w/ SP1 = XRMPFPP_EN 08/29/02 8:00 AM (08:00:00) 55274000 Windows XP Pro Retail w/ SP1a = X1APFPP_EN 03/31/03 8:00 AM (08:00:00) 55274000 Windows XP Pro Retail w/ SP2 = VRMPFPP_EN 08/04/04 8:00 AM (08:00:00) 55274000 Windows XP Pro Upgrade = WXPCCP_EN 08/23/01 8:00 AM (08:00:00) 55276000 Windows XP Pro Upgrade w/ SP1 = XRMPCCP_EN 08/29/02 8:00 AM (08:00:00) 55276000 Windows XP Pro Upgrade w/ SP1a = X1APCCP_EN 03/31/03 8:00 AM (08:00:00) 55276000 Windows XP Pro Upgrade w/ SP2 = VRMPCCP_EN 08/04/04 8:00 AM (08:00:00) 55276000 Windows XP Pro OEM = WXPOEM_EN 08/23/01 8:00 AM (08:00:00) 55274OEM Windows XP Pro OEM w/ SP1 = XRMPOEM_EN 08/29/02 8:00 AM (08:00:00) 55274OEM Windows XP Pro OEM w/ SP1a = X1APOEM_EN 03/31/03 8:00 AM (08:00:00) 55274OEM Windows XP Pro OEM w/ SP2 = VRMPOEM_EN 08/04/04 8:00 AM (08:00:00) 55274OEM Windows XP Pro Volume = WXPVOL_EN 08/23/01 8:00 AM (08:00:00) 55274270 Windows XP Pro Volume w/ SP1 = XRMPVOL_EN 08/29/02 8:00 AM (08:00:00) 55274270 Windows XP Pro Volume w/ SP1a = X1APVOL_EN 03/31/03 8:00 AM (08:00:00) 55274270 Windows XP Pro Volume w/ SP2 = VRMPVOL_EN 08/04/04 8:00 AM (08:00:00) 55274270 Windows XP Pro Tablet PC w/SP1 Disc1 = XRMPFPP_EN 08/29/02 8:00 AM (08:00:00) 55274000 Windows XP Pro Tablet PC w/SP1a Disc1 = X1APFPP_EN 03/31/03 8:00 AM (08:00:00) 55274000 Windows XP Pro Tablet PC w/SP2 Disc1 = VRMPFPP_EN 08/04/04 8:00 AM (08:00:00) 55274000 Windows XP Pro MSDN = WXPFPP_EN 08/23/01 8:00 AM (08:00:00) 55274000 Windows XP Pro MSDN w/ SP1 = XRMPFPP_EN 08/29/02 8:00 AM (08:00:00) 55274000 Windows XP Pro MSDN w/ SP1a = X1APFPP_EN 03/31/03 8:00 AM (08:00:00) 55274000 Windows XP Pro MSDN w/ SP2 = VRMPFPP_EN 08/04/04 8:00 AM (08:00:00) 55274000 Windows XP Pro Evaluation = WXPEVL_EN

Note that this does NOT get rid of WinXP's activation.
Changing the Pid to a Volume License will not bypass activation.
You must have a volume license (corporate) key to do so.