Replace Builtin commands with Custom Commands for CMD.exe

If I do a command like (on windows cmd.exe):

where dir

or

where cd

I get the following message:

INFO: Could not find files for the given patte(s).

This tends to mean to me that cd and dir are not actual programs, but are built in to cmd.exe.

Now the real question is:

Is there ant way to replace cd and dir with other programs? If you wanted to replace say more, you could just put another program by that name in the system PATH in front of where more is.

But you caot do that with cd and dir. Am I just stuck with them?