Const ForReading = 1
Const ForWriting = 2
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objFile = objFSO.OpenTextFile("C:\Text.txt", ForReading)
strText = objFile.ReadAll
objFile.Close
strNewText = Replace(strText, "CH1", "*901*")
Set objFile = objFSO.OpenTextFile("C:\Text.txt", ForWriting)
objFile.WriteLine strNewText
objFile.Close