Try this command from dos prompt:
                         
                          (source dir:file) (target dir:file)  
example type: copy c:dosnotes.doc a:dosnotes.doc

example:C:\>copy c:dosnotes.doc a:dosnotes.doc

Double check for copy to target file by typing: dir <enter>
to see what files are in the target directory to include the copied one. If there are to many files to show on the screen type: dir/p <enter>
for a partial display of the files in the directory.
Good luck got the info from my Computer Lit book from 96'. Kinda old but still has good DOS commands.