Bug in last commit - zip not choosed in non interactive mode

Hi,

Just corrected a small bug in your last commit. In non interactive mode, the only possibility was to specify the zip file name. I added the possiblity to find a single zip, as it was before. It will only fail if no zip is found or many zip are found in non interactive mode. And of course, if a file is specified in the param files, it will be used as the first option.