@TRUENAME[filename] : Returns the true, fully-expanded name for a file. @TRUENAME will "see through" junctions, symbolic links, a SUBST or network mapping. Wildcards cannot be used in the filename.
A leading ~\ or ~/ will be interpreted as the current user's home directory.
If filename is quoted, the returned filename will also be quoted (if necessary).
Note: The @TRUENAME function makes no assumption about the existence of a file or directory. Its filename parameter can be any string and the function will attempt to turn it into a fully qualified "volume + path + name" specification, whether that full reference exists or not.
filename must be in quotes if it contains white space or special characters.