ActiveX technology

• A single fully self-contained COM object and ActiveX control written with ATL 3.0.
• Built for the x86-64 processor architecture. A version for the IA-64 processor architecture is also available on request.
• Requires no external compression DLLs, MFC DLLs, or runtime libraries.
• Both single-threaded (STA) and multi-threaded apartment (MTA) model design.
• Instantiate the component dynamically without putting it on a form.
• Supports multiple instances running simultaneously.
• Supports both Unicode and ANSI in one single control. The library automatically uses Unicode API calls for best performance when running on Windows NT, 2000, and XP.

Compression & Zip file technology

• Supports WinZip 9.0 (and up) compatible AES strong encryption.
• Fast, low memory usage compression engine.
• 100% compatible with the PKZIP 2.04g format.
• 100% compatible with the PKZIP 4.5 format.
• Supports the Zip64 zip file format allowing the creation of Zip files of practically unlimited size (no 4 GB limit).
• Supports the BZip2 (BWT) compression method for 15% to 20% better compression than Deflate on many popular file types, especially XML data.
• BZip2 compression method is excellent for compressing XML data.

Major operations

• Zip files or memory buffers into new or existing zip files.
• Unzip files to disk or directly to memory.
• Compress and decompress strings or buffers completely in memory.
• All compression and decompression modes support streaming and encryption.
• Create fully customizable self-extracting zip files (see section below for features)
• Convert any type of zip file (regular, spanned, multi-part, self-extracting, or spanned self-extracting) into any other type of zip file.
• Reads and writes zip files that span multiple disks.
• Reads and writes multi-part zip files directly to hard drive.
• Update one zip file from another one's contents or merge two zip files together.
• Optional background processing so your code can continue execution while Xceed Zip is working.

Application-component interactivity

• All operations can be aborted at any time.
• Provides status report events on a file-by-file basis as well as on the entire operation being performed, with percentages, byte, and file counts. Easily add any kind of progress bar to your apps.
• Events are triggered whenever a file is being zipped, unzipped, updated, deleted, etc.
• Notifies your application when and why a specific file cannot be processed.
• Notifies your application when a file being zipped or unzipped is about to overwrite an existing file. Your application can then choose to overwrite it or skip it. You can also rename files.
• Provides complete file information for the file currently being processed.

Zip file manipulation functionality

• Obtain global information on a zip file.
• Obtain a detailed list of a zip file's contents via a collection object.
• Obtain a detailed list of a zip file's contents via events.
• Delete files from within a zip file.
• Delete files after they have been successfully and verifiably zipped.
• Test the integrity of a zip file and its contents.
• Process or exclude files based on file attributes, sizes, version resources and dates, or create your own custom include/exclude filters.

Documentation and samples

• Complete, comprehensive documentation provided in an MSDN-style HTML format which is fully context-sensitive so that pressing F1 on a keyword in your IDE opens up the manual to the correct relevant topic.
• Fully commented sample applications for various languages, including VB, Delphi, Visual C++ with ATL and MFC, C++ Builder, and ASP Active Server Pages.

Direct DLL API access

• The library's single DLL can also be accessed as a standard 32-bit DLL through its exported API.
• All properties, methods, and events are exported.
• All exported API calls involving string parameters come in single, wide character, and Unicode versions.
• Events can be handled either by callback functions or by windows messages.

Self-extracting Zip file features

• Create new self-extracting zip files or transform already existing zip files into self-extracting zip files.
• Create self-extracting Zip files for the traditional PKZIP 2.04g compression method. Also now supports the Deflate64™, BZip2, and BWT methods.
• Create self-extracting zip files that support AES encryption.
• Self-extracting zip files can span multiple disks.
• Creates 32-bit self-extracting zip files that work on all Windows 95, 98, ME, NT, 2000, XP, and Vista operating systems or 16-bit self-extracting zip files that work on Windows 3.x as well.