[alpap]

Код:

@echo off
setlocal enabledelayedexpansion
set "sf=<GoogleUsername>" &: Поиск строки "<GoogleUsername>username</GoogleUsername>"
set "sz=s_username" &: Здесь указать что вместо username
<"setting.xml">>$ (for /f "delims=" %%a in ('more') do echo "%%a"|>nul find/i "%sf%" && (
   for /f "tokens=1-3 delims=>< " %%b in ("%%~a") do set "z=%%c"& echo:  ^<%%b^>^<!z:%%c=%sz%!^>^<%%d^>
  ) || (
   echo %%a
  )
 )
)
move $ "setting.xml"
exit

.