Represents the directory type of the file name.
public enum DirectoryType
||Represents an MS-DOS drive letter. It is followed by the drive letter. Or UNC file names, such as \server\share\myfile.xls|
||Indicates that the source workbook is on the same drive as the dependent workbook (the drive letter is omitted)|
||Indicates that the source workbook is in a subdirectory of the current directory.|
||Indicates that the source workbook is in the parent directory of the current directory.|