[Foreigner]

Код:

@echo off
setlocal

for %%i in ("c:\bat\*.bat") do call:1 "%%~nxi"
for /f "tokens=2 delims==" %%i in ('set bat_') do set "bat=%%i"
start "" "c:\bat\%bat%"
goto:eof

:1
set "bat_%random%=%~1"