How do I rename a file using VBScript?

You can rename the file using FSO by moving it: MoveFile Method.

Dim Fso
Set Fso = WScript.CreateObject("Scripting.FileSystemObject")
Fso.MoveFile "A.txt", "B.txt"

I see only one reason your code to not work, missed quote after file name string:

VBScript:

FSO.GetFile("MyFile.txt[missed_quote_here]).Name = "Hello.txt"

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