ArchiveFormat options = get7ZipOptions(archiveFile);
inArchive = SevenZip.openInArchive(options, stream);
int numItems = inArchive.getNumberOfItems();
logger.log(Level.INFO, "Count of items in archive: {0}: {1}", new Object[]{archiveFile.getName(), numItems}); //NON-NLS
progress.start(numItems);
progressStarted = true;
final ISimpleInArchive simpleInArchive = inArchive.getSimpleInterface();
//setup the archive local root folder