Since XP Windows users have ability to view, compress, extract zipped files natively. Microsoft's developers decided to create shell extension that does this job. Shell extension is library that shell (explorer.exe) uses to communicate with in order to achieve results. In case of ZIP files this particular library is zipfldr.dll.   How does it work? By default when you double-click ZIP file, explorer opens it allowing you to browse around it pretty much the same way as you would through the ordin