Join the XP Media Center Edition to Domain

Is it strange to have a XP media center machine in your corporate domain? It is, but....when the user is the big boss, you just have to make it happen.  It sounds impossible and Microsoft is not going to like it. The whole trick is to change a single registry key.
1. By default, join the domain option is greyed out in XP media center edition.
2. Boot the pc from a XP cd , and go to recovery console mode.
3. Log into the correct installation, usually only one available.
4. Make a copy of the system file. 
    cd/system32\config
    copy system c:\
    exit
5. Reboot the pc to normal.
6. Go to Start > Run > and type REGEDIT
7. I suggest your make a copy of the registry file before you do any changes.  Go to File > Export and browse a location to store the copy.
8. Select 'HKEY_LOCAL_MACHINE'
9. Go to File > Load Hive
10. Browse and select c: \system
11. Specify key name TEMP and click OK
12. Expand HKEY_LOCAL_MACHINE > TEMP > WPA > MedCtrUpg
13. Change the IsLegacyMCE to 1 and click ok
14. Click the TEMP subkey
15. Go to File > Unload Hive
16. Reboot the pc from XP cd and go to Recovery Console again.
17. Select the right installation and log in
18. Type
     cd\
     copy SYSTEM C:\WINDOWS\SYSTEM32\CONFIG\SYSTEM
     del SYSTEM
     exit
19. Reboot the pc to normal
20. The Join Domain option is available to join this pc to any domain.