How do you download and play movies that are posted in newsgroups?

Tool-assisted speedruns are not created to show off one's playing skills, but rather to show off all kinds of techniques that are theoretically possible in the game but impossible to do in practice, and to try and establish an “optimal” playthrough of a game. Because of this, tool-assisted runs discern themselves by pushing the gameplay to the physical limits of the game's engine. This is extensively demonstrated in the Mega Man and Rygar runs.