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These functions pertain to directory manipulation.  The following functions
are defined:

chdir
    change current working directory

closedir
    close opened directory file

getcwd
    get current working directory

mkdir
    make a new directory

opendir
    open directory file

readdir
    read file name from directory

rewinddir
    reset position of directory stream

rmdir
    remove a directory

_wchdir (see chdir)
    change current working directory

_wclosedir (see closedir)
    close opened directory file

_wgetcwd (see getcwd)
    get current working directory

_wgetdcwd (see _getdcwd)
    get current directory on drive

_wmkdir (see mkdir)
    make a new directory

_wopendir (see opendir)
    open directory file

_wreaddir (see readdir)
    read file name from directory

_wrewinddir (see rewinddir)
    reset position of directory stream

_wrmdir (see rmdir)
    remove a directory