In the beginning of this chapter, our File Explorer could only navigate the filesystem and open files. We extended it to show a file in the folder, and to copy/paste and delete files. We exploited the NW.js API to provide the files with the dynamically-built context menu. We learned to exchange text and images between applications using system clipboard. We made our File Explorer support diverse command-line options. We provided support for internalization and localization, and examined the protection of the sources through compilation in the native code. We went through the packaging process and prepared for distribution. Finally, we set up a release server and extended the File Explorer with a service for autoupdating.