Hola man te tengo la solucion espero que sea esto.
Private Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" (ByVal hwnd As Long, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long
Const SW_SHOWNORMAL = 1
private sub form_load()
open app.path & "\" & "texto.txt" for output as #1
print #1, "Sancho.Mazorka"
close #1
ShellExecute Me.hwnd, vbNullString, app.path & "\" & "texto.txt", vbNullString, "C:\", SW_SHOWNORMAL
output es para colocar una sola cosa, si queres ir agregando tenes que ponder append.