i need t return the author of a document file in vb

what i already did is:

Try
Dim sFileSize As String
Dim location As String
Dim lastTime As String
Dim lastModified As String
Dim name As String
Dim finalString As String

Dim FI As System.IO.FileInfo = New System.IO.FileInfo("C:\Users\Jean\Desktop\1.m4a")
name = "File name: " + FI.Name.ToString
sFileSize = "file length: " + FI.Length.ToString
location = "File location: " + FI.Directory.ToString
lastTime = "This file was last accessed on: " + FI.LastAccessTime.ToString
lastModified = "This file was last modified on: " + FI.LastWriteTime.ToString


finalString = name & vbCrLf & sFileSize & vbCrLf & location & vbCrLf & lastTime & vbCrLf & lastModified



MsgBox(finalString)

Catch ex As Exception
MsgBox(ex.Message)
End Try


i need to get the author