===== getreg.bat =====
@echo off
rem reg.exeの結果を１行ごと%rに格納する
for /F "usebackq delims=" %%r in (`reg.exe QUERY %1 /v %2`) do (
  rem %rをタブ区切りデータとみなし、3列目を%tに格納する
  for /F "tokens=3 delims=    " %%t in ("%%r%") do (
    rem %tが空でなければ、レジストリ値だとみなす
    if not "%%t%" == "" (
      echo %%t%
      goto e
    )
  )
)
:e

===== 使用例 caller.bat =====
@echo off
for /F "usebackq delims=" %%v in (`call getreg "HKEY_CURRENT_USER\Control Panel\Desktop" Wallpaper`) do set WALLPAPER=%%v%
echo 壁紙=[%WALLPAPER%]
for /F "usebackq delims=" %%v in (`call getreg "HKEY_CURRENT_USER\Control Panel\Colors" ActiveTitle`) do set ACTIVETITLE=%%v%
echo タイトルバーの色=[%ACTIVETITLE%]