Thanks Choroba,
I have tried the full path, it doesn't work.
I have also tried with double quotes, with just the name
mariadb_config.pl without the directory "./" but it doesn't work. I have learned that the file must be in the PATH. On Windows, the current directory is always in the PATH. So I don't understand. Next step : I can replace the original script which is in the path and does not work with mine which works well.
Best,