Returns the resolved (local) path of this file object as
String. If the path is on a local
drive or is on a shared network resource mapped to a drive letter,
the local path or drive letter is returned; otherwise, the UNC path is returned.
Note: In the case of an image sequence, the resolved path will not
be a valid file but rather the symbolic name for the sequence (for
example, "c:\images\mysequence.[1..10].pic"). To get a specific
file use FileReference.GetFileInSequence
and FileReference.NumberOfFilesInSequence.