anchor.diff:  msiexec /qb /i "%SEVENZIP_PATH%"
   @if errorlevel 1 echo ==^> WARNING: Error %ERRORLEVEL% was returned by: msiexec /qb /i "%SEVENZIP_PATH%"
   ver>nul
  +
   set SEVENZIP_INSTALL_DIR=
   for %%i in ("%ProgramFiles%" "%ProgramW6432%" "%ProgramFiles(x86)%") do if exist "%%~i\7-Zip" set SEVENZIP_INSTALL_DIR=%%~i\7-Zip
   if exist "%SEVENZIP_INSTALL_DIR%" cd /D "%SEVENZIP_INSTALL_DIR%" & goto find_sevenzip
  
positive.code: :install_vbox_guest_additions_from_iso
  call :install_sevenzip
  if errorlevel 1 goto exit1
  echo ==^> Extracting the VirtualBox Guest Additions installer
  7z x -o"%VBOX_ISO_DIR%" "%VBOX_ISO_PATH%" "%VBOX_SETUP_EXE%" cert
  @if errorlevel 1 echo ==^> WARNING: Error %ERRORLEVEL% was returned by: 7z e -o"%VBOX_ISO_DIR%" "%VBOX_ISO_PATH%" "%VBOX_SETUP_EXE%"
  
negative.code: ::::::::::::
  :install_sevenzip
  ::::::::::::
  if "%PROCESSOR_ARCHITECTURE%" == "x86" (
    set SEVENZIP_URL=%SEVENZIP_32_URL%
  ) else (
    set SEVENZIP_URL=%SEVENZIP_64_URL%
  )
  pushd .
  set SEVENZIP_EXE=
  