These 44 sounds are all made from standard dialogue from the Age of Empires II campaigns. The files here have simply been taken out of their context and made into separate files, so that they are a lot more useful for making custom scenarios.
Many of these were originally uploaded back in 2006, but were taken down after I updated the file with sounds from other games. That mistake will not be repeated. :P
Also, I can't quite remember what the "LBD" label on all the files stands for... Lord Basse Dialogue, maybe? Or something along those lines.