Is there a way that I manually have a user look up the current Codepage and locale of their windows OS? Is there a registry setting that stores that information?
It would also be useful if the technique worked all the way back to Windows 2000.
chcp will get you the active code page.
systeminfo will display system locale and input locale, among other things.
"Note: This command (systeminfo) is not available in Windows 2000 but you can still query Windows 2000 computer by running this command on Windows XP or Windows 2003 computer and set remote computer to Windows 2000 computer. If the current user logon that execute this command already has privilege on remote machine (for instance, Domain Administrators), you don’t have to use /u and /p."