While I am unlikely to install something that loads yet another shell extension, downloading before the upload is finished is a cool idea. The last time I saw it was on ge.tt, which seems to have evaporated.
Thanks for your feedback :)
At first we did load a shell extension but we stopped due to performance issues. now its just a user-registry entry that starts the executable with the dir/file as parameter.
Is this, in anyway, related to the unity game engine? The logos look too similar.