WinRK is a new high performance file archiver, supporting all the most common archive formats in use today: ZIP, GZIP, BZIP2, TAR, RAR, ACE and ISO. WinRK's ZIP support is fully compatible with both the Zip64 standard and the new WinZIP AES encryption standard. This means that ZIP files created with WinRK can take advantage of file and archive sizes of over 4GB, along with strong encryption capabilities. The ZIP deflate and deflate64 algorithms have been improved as well, providing 10-20% smaller archives in most cases, without loosing any compatibility!

WinRK also provides a new high performance RK archive format. This format was designed from the outset to remove many of the limitations of older archive formats, and so provides much better compression and security than other formats. It supports a virtually unlimited archive size, which makes it ideal for very large backups. It also provides compression options ranging from fast and efficient, all the way to a 'spare no cost' approach which provides the very best compression ratios in the world.

One of the most interesting innovations that WinRK brings to archiving is a modern user interface design. Many of the most popular archivers require unintuitive dialog boxes to be carefully navigated in order to add files to an archive, or even to extract files in some cases. WinRK provides a much more intuitive interface that treats archives in much the same way as a CD-burner treats CDs. This means that files may be scheduled to be removed from, or added to an archive at the same time so as to reduce the time taken actually performing the modifications. This can be especially important for very large archives. It also means that no restriction is placed on modifying archives, even for so called solid archives. Archives may have files removed or added at any time.