large file downloads

Hi

I'm interested in purchasing CKFinder, but I'm worried about it's ability to deal with large file downloads. In this case, large files would be 500MB to 1.5GB and they are already compressed.

Since I would be using CKFinder with PHP - allowing users to download files of this size becomes a serious memory issue (for PHP) unless x-sendfile is used.

Does CKFinder support x-sendfile and if not, how would I manage to allow users to download files of this size using CKFinder and PHP?

Thanks