Check if a file is unicode encoded

Check file for Unicode encoding

Private Function is_unicode(ByVal path As String) As Boolean
       Dim enc As System.Text.Encoding = Nothing
       Dim file As System.IO.FileStream = New System.IO.FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read)
       If file.CanSeek Then
           Dim bom As Byte() = New Byte(3) {} ' Get the byte-order mark, if there is one
           file.Read(bom, 0, 4)
           If (bom(0) = &HEF AndAlso bom(1) = &HBB AndAlso bom(2) = &HBF) OrElse (bom(0) = &HFF AndAlso bom(1) = &HFE) OrElse (bom(0) = &HFE AndAlso bom(1) = &HFF) OrElse (bom(0) = 0 AndAlso bom(1) = 0 AndAlso bom(2) = &HFE AndAlso bom(3) = &HFF) Then ' ucs-4
               Return True
           Else
               Return False
           End If
           ' Now reposition the file cursor back to the start of the file
           file.Seek(0, System.IO.SeekOrigin.Begin)
       Else
           Return False
       End If
   End Function