HKLM\SYSTEM\CurrentControlSet\Control\Nls\
The CodePage subkey contains data that associates code page IDs supported by Windows 2000 with code page translation files installed on the system.
Each entry in the CodePage subkey represents one supported code page. If the code page is installed on the system, the value of the entry is the name of the code page file. If the code page is supported but not installed, the value field of the entry is blank.
There are also some special code page entries installed with Windows 2000. These entries associate a system default with another code page entry.