If Command Extensions are enabled CHDIR changes as follows: The current directory string is converted to use the same case ...

If Command Extensions are enabled CHDIR changes as follows:

The current directory string is converted to use the same case as
the on disk names.  So CD C:	EMP would actually set the current
directory to C:	emp if that is the case on disk.

CHDIR command does not treat spaces as delimiters, so it is possible to
CD into a subdirectory name that contains a space without surrounding
the name with quotes.  For example:

    cd \winnt\profiles\username\programs\start menu

is the same as:

    cd "\winnt\profiles\username\programs\start menu"

which is what you would have to type if extensions were disabled.