Experienced with the "NES+FDS" ROMs that are Headered and Unheadered

[P0W3]

I have experienced with the "NES+FDS" ROMs that are headered and unheadered. I know that most emulators do not support the unheadered "NES+FDS" ROMs. Most emulators prefer the headered "NES+FDS" ROMs. Even though, the headers from the FDS ROMs are not needed. Dat-o-Matic used to have the checksums of the unheadered NES ROMs only. Now, there are the checksums of the headered NES ROMs. So, do I really have to go with the headered NES ROMs? Because, using the headered NES ROMs would be compatible for most emulators.

[LodanZark]

Unheadered ROMs only work on Mesen, because it uses an internal database to identify the ROM proprieties, such as mappers, mirroring, memory sizes, etc,
You can find the database here: https://github.com/NovaSquirrel/Mesen-X/blob/master/GUI.NET/Dependencies/MesenDB.txt

It's been a while since the database is not being updated, which does not include the latest changes listed in the NewRisingSun NES2.0 XML ( https://forums.nesdev.org/viewtopic.php?t=19940 ), No-Intro started to DAT NES2.0 headered ROMs based in the NewRisingSun work (mostly), so it's preferable to use no-intro verified headered ROMs over unheadered ones.

For the FDS, the headers are kinda redundant...