unable to create a file if already exiists
 

I am creating a simple text file. And appending the data to the file. i need
to run the same macro every time.
It is fine when i run the script at least once. When i am running for the
first time it is creating the file and it is showing the file is exist window.
Please help or let me know is there another way of creating a file and error
handling if file exists.

************
Set fso = New FileSystemObject
fso.CreateTextFile fileName, overwrite:=True

If fso.FileExists(fileName) Then
If MsgBox("The file " & fso.GetFileName(fileName) & " already
exists. Do " & _
"you want to replace the existing file?", vbYesNo +
vbExclamation + _
vbDefaultButton2, PROJECT_NAME) = vbNo Then
Exit Sub
End If
End If


Set ts = fso.OpenTextFile(fileName, ForWriting, True)
With Range(ActiveWorkbook.Worksheets("Anvil").Cells(1, dataColumn), _
ActiveWorkbook.Worksheets("Anvil").Cells(rowCount, dataColumn))
For Each tempCell In .Cells

If tempCell.Row < rowCount Then
tempCell.Value = Left(tempCell.Value,
Len(tempCell.Value) - 1)
Call ts.WriteLine(tempCell.Value)
Else
tempCell.Value = Left(tempCell.Value,
Len(tempCell.Value) - 1)
Call ts.Write(tempCell.Value)
End If
Next
End With