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var unzippedFiles = $Files.UnZip(zipFile.Id);
unzippedFiles.forEach(function(file) {
    var fileContent = $Files.GetString(file.Id);
    // do sth with the file content
});

// It would be a good practice to delete the archive file when you are finished using it
// since the files in it are also saved by calling the UnZip method
$Files.Delete(zipFile.Id);