is this an action replay ROM ??

Nope, it's device for use with Nintendo DS games (of course official ones)

lol seriously. Cheet codez gaiezzzz!!!
I'm definitely gonna have to pass on this one  

And just how would you use this?

Also don't most flash carts now have cheat functions built in?

yeah, they do.. but only for older games.. and they're sort of limited
i'm not sure what an AR is like, but i assume you can do all sort of things, and with newer games

I don't know if other linkers do that too, but with the M3 real, you have an included cheat database, but it is 100% compatible with official Action Replay cheats too.. You jut download .xml database from datel (they are made to update the AR) and put then on the M3 real and you can use them directly (with new games since it's datel official databases !)
This is possible with m3 simply too but you need a file converter to make the xml file readable for the m3 simply

Yeah, at this point, the ARDS is virtually useless. You've got flashcards with built-in cheats (most all of them nowadays), and if you have commercial games, you can just use NitroHax. Granted, it's not as user friendly as the ARDS itself, but it's $25 less (aka FREE) and uses .xml cheats.

The only reason for buying this is in conjunction with Datel's Trainer Toolkit, which lets you make your own ARDS cheats. But there are several (again, FREE) methods of making your own cheats, so again, this is pointless.

Although since this is a ROM, I wonder if it will work on a slot-1 flashcard...

Weren't there dumps of R4 and M3 cards and that TV device thingy?
Mighty pirates dump these just to show they can, it's got no use.

I figured I would post on how to update the usercheat file in the system dir for M3 Simply(might work for Real) and R4.

You'll need Cheat Code Editor(latest is 1.01) and Action Replay DS code manager software. You can find Cheat Code editor here under the download section(Downloads>PC Software>Development) and you can find the Action Replay DS software here.

Install the software and run it. Click Software Update at the top right just to make sure your running the latest version. Afterwards run it again(if you do update) and drag and drop the subscriptions(code lists) you want down to my code lists(tip: delete my codelist or whatever thats their if you like).

Finally run Cheat Code Editor and go to file>import xml and go to X:\Program Files\Datel\Action Replay Code Manager\local_codelists and select the code list you want and click ok. When your done adding all the lists you want then click the save icon or go to file>save and save it to your system file and overwrite your usercheat.dat .

Do NOT use this method to overwrite the cheat.dat file because you cannot update it(that I know of). This is a lot better then the AR in my honest opinion.

By the way what software can I use to hack DS games? I always liked the trainer thing in AR and I used to love using the GB Gameshark to hack my own codes.