Strawberry is a great tool that checks folders for incoming files. It will repair and unpack the files for you. It currently supports Par2, Split, Zip, and Rar files. When used in combination with your peer-2-peer client, newsreader software or other download client Strawberry will automatically repair and unpack incoming files for you.
Full Specifications
What's new in version 1
General
ReleaseNovember 7, 2008
Date AddedSeptember 13, 2006
Version1
Operating Systems
Operating SystemsWindows 2000, Windows Vista, Windows 98, Windows Me, Windows, Windows XP