QuickZip

The best thing about this application is that, in just 4 megabytes, it manages to gather an encryptor, an extractor, a reader, and a file scanner. It can read up to 40 different file extensions: HTML, TXT, CSV, PDF, or ZIP. For the latter, you can check out its content even before you extract the file. With this application, you can run the entire process of installing a document: extract the file, scan it for viruses, and install it. You can also use additional features like file encryption. Even though nowadays there's a great variety of programs that perform such features, some of which are even included in Windows by default, this program simplifies the task by gathering all of them into just one application.