I have about the same number of midi files as well, but like all huge collections, there are a lot of duplicates, loads of bad ones that are not worth keeping, and maybe 50,000 exceptionally good ones.

I also have about 55,000 style files on hand, but in this case, no duplicates and a lot of very good ones.

Unfortunately, it is painstakingly slow to sort through all this and put it into order. Each file must be played one by one to determine their quality - that's more time than I have left on the planet.

Good luck,

Gary