traverse files recursively with certain extensions in windows folder, and unix2dos convert line endings to crlf

unix2dos_crlf.bat

@echo off
setlocal

set "target_directory=%~1"
shift
set "extensions=%*"

if not defined target_directory (
    goto ShowUsage
)

if not defined extensions (
    goto ShowUsage
)

for %%e in (%extensions%) do (
    for /R "%target_directory%" %%f in (*.%%e) do (
        echo %%f
    )
)

endlocal
exit /b 0

:ShowUsage
echo Usage: %0 [path_to_directory] [file_extension1] [file_extension2] ...
echo Usage: %0 C:\your_folder txt jpg png
exit /b 1