Use code like the following to parse you binary files:

Private Type CharRecord   ' Define user-defined type.
   Char As String * 1
End Type

Dim MyRecord As CharRecord, _
Position As Integer, _
MySize As Integer

MySize = FileLen("C:\TEST.DAT")   ' Returns file length (bytes).

Open "C:\TEST.DAT" For Random As #1 Len = Len(MyRecord)   ' Open it for random access with 1 character records

Position = 3   ' Define record number.
Get #1, Position, MyRecord   ' Read third character.

Debug.Print MyRecord.Char   ' Send it to immediate window

Close #1    'Do not forget this

Advice whether this is what you need!
Kind Regards