Warning: I'm still pretty new to MAME, so bear with me.

In an effort to further a personal project I'm working on, I'm trying to use MAME 0.182 to run console games. In order to prove said project out further, I'm trying to get (for starters) Eternal Champions (usa) to run via command line, without having to use the File Manager to load the game data and reset to start the game; Just run the command, skip the copyright screen, and jump right into the game.

To put it shortly, I'm trying to:
-Play Eternal Champions (USA)
-For the Genesis
-Through MAME 0.182
-Bypassing the copyright screen
-via Command Line
-In Windows 10

Right now, I'm encountering a lot of "File not found" errors when I try to start this the traditional CMD way:

>mame64 genesis eternalcu

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or

>mame64 genesis eternalc

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I've got the roms (which I snagged from EP) in the MAME dir "roms" folder, and I've tried renaming and rezipping them, to no avail. However, when I simply try to run "mame64 genesis", and then selecting the roms through the file manager and resetting, the game runs fine. Where am I going wrong?

And please don't tell me to just run in in Kega Fusion; I need to specifically to run it through MAME.

Thanks for reading!