Option Explicit

Private Declare Function FindExecutable Lib "shell32.dll" Alias _
    "FindExecutableA" (ByVal lpFile As String, ByVal lpDirectory _
    As String, ByVal lpResult As String) As Long

Private Sub Drive1_Change()
  On Error Resume Next
  Dir1.Path = Drive1.Drive
  Drive1.Drive = Dir1.Path
  Text1.Text = ""
End Sub

Private Sub Dir1_Change()
  File1.Path = Dir1.Path
  Text1.Text = ""
End Sub

Private Sub File1_Click()
  Dim exe As String
  Dim pfad As String
  Dim datName As String
  Dim result As Long

  exe = Space(254) & Chr(0)
  pfad = Dir1.Path
  datName = File1.FileName
  result = FindExecutable(datName, pfad, exe)
  Text1.Text = Left(exe, InStr(exe, Chr(0)))
End Sub