Disable "Compatability Mode" Tab for Windows XP

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I know that in Win2000 you can enable and disable the compatibility mode tab
by registering or unregistering slayerui.dll in the %systemroot%\apppatch
folder. This file doesn't exist in Windows XP that I can find, though.

The problem is that my Compatibility Mode tab is /MISSING/ on my WinXP Pro
box. I just finished re-installing windows last week and I had no problem
running the few 16bit apps I still use occasionally. Now when I try to run a
16bit app nothing happens. Absolutely nothing. No error or anything. Niether
the app nor "wowexec" show up in the task list immediately after double
clicking the 16bit exe. If I try to pre-load wowexec.exe it will crash as
soon as I run a 16 bit app. I'd try reinstalling my apps, but their
installers are also 16bit and won't run either ;) I suspect the inability to
run 16bit apps and the missing compatilibity tab must be linked, but I can't
figure it how or why either bug is occuring.

I just finished running "sfc /scannow" which usually helps things, but it
didn't help. I've also deleted my group policy folder and let windows create
default policies, and have tried on multiple user accounts (even a new user
account) so I know it's not account specific.

Any thoughts? I'm running WinXP Pro with SP2, and I don't have the option to
downgrade to a SP1 since SP2 was already slipstreamed into this CD when I
bought it.
.

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