' Writing String Content Following n-th Line of Existing Text File
Const FOR_READING = 1
Const FOR_WRITING = 2
strFileName = "C:\scripts\test.txt"
strNewContent = "sample string content"
iInsertAfterLineNumber = 3
Set objFS = CreateObject("Scripting.FileSystemObject")
Set objTS = objFS.OpenTextFile(strFileName,FOR_READING)
strContents = objTS.ReadAll
objTS.Close
Set objTS = objFS.OpenTextFile(strFileName,FOR_WRITING)
arrLines = Split(strContents, vbNewLine)
For i=0 To UBound(arrLines)
If i = iInsertAfterLineNumber Then
objTS.WriteLine strNewContent
End If
objTS.WriteLine arrLines(i)
Next