assocx

@echo off
setlocal
if "%1"=="*" (
set temp=*
goto:start)
reg query HKCR\.%1 1>nul 2>nul
if %errorlevel%==1 goto:error
for /F "tokens=4* delims= " %%i in ('reg QUERY "HKCR\.%1" /ve') do (
set temp=%%i
) 2>nul
echo %temp%
:start
for /F "tokens=4 delims=\" %%a in ('reg QUERY "HKCR\%temp%\shell" 2^>nul') do (
for /F "tokens=3*" %%i in ('reg query "HKCR\%temp%\shell\%%a\command" /ve 2^>nul') do echo %%a: %%j ) 2>nul
if %errorlevel%==1 goto :error
exit /b
:error
echo this file not exist
goto :EOF