I have been using glary utilities. File splitter tool of it is really so smart that I recommend to all my colleagues and friends for file transferring. But this tool is contained in the Glary Utilities---a package of many PC maintenance applications. You may download an independent one on its homepage or the entire glary utilities on CNET: http://download.cnet.com/Glary-Utilities/3000-2094_4-10508531.html?tag=mncol;pop