I remember I read nintendo caught using downloaded rom files on their virtual consoles some years ago...later explained that they just use the same kind of file what the nes emulator can understand...so they use a nes emulator in the virtual console with a nes compatible rom file....do you...
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi