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.