[alpap]

ну и свой вариант прикреплю, пусть будет:

Код:

@echo off
set "f=file.ini"
set "sz=MainVersion"

<"%f%">$ (for /f "delims=" %%a in ('more') do 2>nul set "%%a"& @call :# "%%a")
>nul move $ "%f%"
pause& exit

:#
 @echo %~1|>nul find "%sz%" && (
  for /f "tokens=1-4 delims=." %%a in ('call echo %%%sz%%%') do set /a t4=%%d+1& call echo %sz%=%%a.%%b.%%c.%%t4%%
 ) || (
  echo %~1
 )
@exit /b