Internet Explorer has a file download limit of 4GB (2 GB on IE6). Firefox does not have this problem (haven\'t tested safari yet) (More info here: http://support.microsoft.com/
@levand The problem only exist in IE (it works in Firefox) so while ActiveX would only work on IE, IE is the only one we need the work around for.
@travis - interesting idea. Not sure if it will work for what I need but I'll keep it in mind. I'm hoping to find something to integrate with the existing site instead of having to go out to a third party. It would also require me to setup a bittorrent tracker which wouldn't be as easy as it sounds for this application because different users will have different access to different files.