continuing download of a file once you find a larger one with same name

It sometimes happens to me that I find a good video but it stops in the middle. Later I find one with exactly the same name but a larger file size.

I thought it would be great if the old file could be automatically detected and the new one appended to it, thus reducing download.

I've used gnotella before and used to manually add my old file in the downloads.txt file to trick it into doing this, but XoloX resumeinfo.txt file is just a bit more tricky, with all the parts and so on... :-)

Thanx,

Björn