Convert NCO to ZIP

It seems that .nco files produced by Nero BackItUp are just ZIP archives with unique extension and such there is really no need to convert them to .zip file, which means no nco to zip conversion is possible. If you need to, it should be possible to just rename the file suffix from from nco to zip and extract the contents. Some file archivers might actually recognize .nco files and you do not need to rename the extension.