@echo off
@setlocal
rem cobbled together by https://github.com/nefarius

set MYDIR=%~dp0
pushd "%MYDIR%"

rem grab current value
for /f "tokens=1,2*" %a in ('reg query "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" /v path') do set currentValue=%c

SETLOCAL EnableDelayedExpansion

NET SESSION >nul 2>&1
IF %ERRORLEVEL% EQU 0 (
	for /d %%d in (*.*) do (
		set newValue=%MYDIR%%%d
		rem concat previous and new value
		set currentValue=%currentValue%;%newValue%
		rem write back new value
		reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" /v Path /t REG_EXPAND_SZ /d "%currentValue%" /f 2>nul
		echo Added !currentValue! to system PATH
	)
) ELSE (
    ECHO You need to run this script as Administrator
)

popd
endlocal
pause