validate steam games

REM http://gaming.stackexchange.com/q/95122/27134
REM ps: this doesn't work as Steam will only validate one game at once, but running steam.exe
REM steam://validate/ exits immediately, passing the command onto the instance of steam that is already
REM running

@echo off
SetLocal

For /F "tokens=3*" %%A in ('reg query "HKLM\Software\Valve\Steam" /v InstallPath') do set STEAM=%%A

If "%STEAM%"=="" For /F "tokens=3*" %%B in ('reg query "HKLM\Software\Wow6432Node\Valve\Steam" /v InstallPath') do Set STEAM=%%B

If "%STEAM%"=="" Set /p STEAM="Enter steam location: "

For /F "tokens=1" %%C in ('dir /b /a:d %STEAM%\userdata') do Set USERDATA=userdata\%%C

echo %STEAM%\%USERDATA%
pause

For /F "tokens=1" %%D in ('dir /b /a:d %STEAM%\%USERDATA%') do Call %STEAM%\steam.exe steam://validate/%%D

EndLocal