REM Usage: .\unpack.bat filename.zip
REM Usage: .\unpack.bat filename.zip c:\
@echo off
set FILENAME=%1

if NOT "%~2" == "" (
    set DESTPATH=%2
    powershell -command "Expand-Archive -Force -Path '%FILENAME%' -DestinationPath '%DESTPATH%'"
) else (
    powershell -command "Expand-Archive -Force -Path '%FILENAME%' -DestinationPath '%~dp0'"
)