JSI Tip 10294. How can I replace every occurrence of a string in a file?

I have scripted RepInFile.vbs to replace every occurrence of a string in a file.

The syntax for using RepInFile.vbs is:

cscript //nologo <Drive:>\Folder\RepInFile.vbs FileName OldString NewString

Where:

FileName  is the fully qualified path to the file.

OldString is the string you want to replace. Case is respected.

NewString is the replacement for OldString.

RepInFile.vbs contains:

Option Explicit
Dim objFSO, objFile, strContents
Dim oArgs, FQFN, oTxt, nTxt
Const ForReading = 1
Const ForWriting = 2
Set oArgs = WScript.Arguments
If oArgs.Count  3 Then Wscript.Echo "Syntax: cscript //nologo RepInFile.vbs FileName OldString NewString"
If oArgs.Count  3 Then Wscript.Quit
FQFN = oArgs(0)
oTxt = oArgs(1)
nTxt = oArgs(2)
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objFile = objFSO.OpenTextFile(FQFN, ForReading)
strContents = objFile.ReadAll
objFile.Close
If InStr(strContents, oTxt) Then
	strContents = Replace(strContents, oTxt, nTxt)
End If
Set objFile = objFSO.OpenTextFile(FQFN, ForWriting)
objFile.Write strContents
objFile.Close