@echo off
setlocal enabledelayedexpansion
cd /d "%~dp0"
@REM 文件类型
set ext=.png .jpg .jpeg .bmp .gif
@REM 打开程序
set app=notepad.exe
for %%A in (%ext%) do call :foo1 %%A
endlocal
pause
exit /b

:foo1
set alpha=abcdefghijklmnopqrstuvwxyz
set valueExist=
for /f "tokens=1-2*" %%A in ('reg query "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts\%~1\OpenWithList"^|find /i "REG_SZ"') do (
  if /i "%%~C"=="%app%" (
    set valueExist=1
    goto break
  )
  if /i "%%~A"=="MRUList" (
    set MRUList=%%~C
  ) else (
    set alpha=!alpha:%%~A=!
  )
)
:break
if defined valueExist goto end
set key=%alpha:~0,1%
reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts\%~1\OpenWithList" /v %key% /t REG_SZ /d "%app%" /f
reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts\%~1\OpenWithList" /v MRUList /t REG_SZ /d "%MRUList%%key%" /f

:end
exit /b
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