DosCreateDir enables an application to define extended attributes for a subdirectory at the time of its creation.

If any subdirectory names specified in the path name do not exist, the subdirectory is not created. Upon successful return, a subdirectory is created at the end of the specified path.

An application must issue DosQuerySysInfo to determine the maximum path length that the operating system supports. The returned value should be used to dynamically allocate buffers that are to be used to store paths.

If a program with its NEWFILES bit set tries to create a directory on an FAT file system drive and specifies blanks immediately preceding the dot in a file name, the system rejects the name. For example, if c: is an FAT file system drive, the name "file .txt" is rejected, but "file.txt" is accepted.