this script removes the UTF-8 BOM "" 0xEFBBBF from the beginning of a file / just drag and drop a file on this script

delete-utf8-bom.vbs

Option Explicit

Const UTF8_BOM = ""

Const ForReading = 1
Const ForWriting = 2

Dim fso
Set fso = WScript.CreateObject("Scripting.FileSystemObject")

Dim f
f = WScript.Arguments.Item(0)

Dim t
t = fso.OpenTextFile(f, ForReading).ReadAll

If Left(t, 3) = UTF8_BOM Then
  fso.OpenTextFile(f, ForWriting).Write (Mid(t, 4))
  MsgBox "BOM deleted!"
Else
  MsgBox "UTF-8-BOM not found!"
End If