These are modified ISOs of the 2004 MediaBlasters/AnimeWorks release of Here Is Greenwood. A third audio track was multiplexed in, this is the 'lost' dub produced in the 1990s by Software Sculptures which was only ever presented on VHS and LaserDisc and replaced as the license changed hands. In this case the audio was stripped from the LDs by a third party who eventually allowed me to have ISO copies of their creation. Since the series seems to be unlicensed at this point, why not share it to the others?
For those seeking 'video files' I'm sure someone else will transcode up some MKVs out of these if there's enough interest.
All of the original DVDs menus are intact so to select the third audio track you will need to do so manually rather than in the discs own menus.