PKZIP compresses files an average of 50-70% with many large text and database files compressing well over 90%. PKZIP's simple point-and-click interface lets you easily zip up one file or an entire hard drive, and store them in a .ZIP file. The latest version, PKZIP 2.70 for Windows, includes the following new features: Email MAPI Support, Embed PKWARE Authenticity Verification (AV) Information, Enhanced 32-bit Windows Self-Extractor, Extended configuration options for Windows self-extractors, and Improved Self-Extractor Run After Extraction Functionality.