To create a new subdirectory, an application calls DosCreateDir and specifies a directory path name. If the call is successful, a new subdirectory is created at the end of the path on the specified disk. If no path name is specified, a new subdirectory is created at the end of the current directory for the process. If any subdirectories in the path do not exist, the subdirectory is not created.

Because a subdirectory is a file object, an application also can define an extended attribute for the directory when it is created during this call. See Extended Attributes for more information on extended attributes.