Adding text to notepad file

[TemClark]

Is there a way to add text into a notepad file without deleting what was already in the notepad file?
Right not im using this to add text to a notepad file.

   Dim hFile As Long
   Dim sFilename As String

   sFilename = "c:\demo.txt"
   

   hFile = FreeFile
   Open sFilename For Output As #hFile
      Print #hFile, Text1.Text
   Close #hFile

The problem is that it overwrites the text already in the notepad file.
I cant store the text from the notepad file in a temporary textbox because theres too many characters in the notepad file and a textbox cannot fit it all.