Hello,
the question in the title refers to attached files. I have them since 2014 or earlier, and recently tried to find the source again - with no success. I hope that Final Fantasy fans here might remember if they saw these downloads before.

Distinctive features of these collections are:
- huge number of tracks (for example, 37 files for FF11, which is more than published on most sites);
- file names in a fixed format "ff##-#.mid".

I already checked a few well-known midi music sources (Mirsoft, Midi Shrine, some web search results) and a number FF fan sites (ffextreme, thefinalfantasy.com, ffshrine of course, and others). This version of midi collections is not published on any of them, so it must be somewhere else.

Attachment: https://1drv.ms/u/s!App_YLHfwVtdgRWurz6xO11njRUC?e=PbWroG
(was unable to attach zip files directly due to funny size limitation)

Well I think is a grouped mix of all MIDI found on every midi sites, like for example FFXI: https://www.kh insider.com/midi/ps2/final-fantasy-xi + https://web.archive.org/web/20190331100803/http://www.geocities.jp/kurogeki/page015.html + etc..

However not so long time ago, I've found a way to directly have the ORIGINAL midi from the composer himself. Let's always take FFXI, in this site you can download PSF2 files: https://www.zophar.net/music/playstation2-psf2/final-fantasy-xi-zilart-no-genei

So after you download, you can open the PSF2/PSF file with VGMtrans and export the original midi + soundfont from the composer. So it is the most accurate (perfect) than other MIDI you find online.

You can search for other console games that use sequential MIDI instead of MP3, like PS1, PS2 and other you can find on this site: https://www.zophar.net/music