hi i've got linux beta in settings im just confused as to how to open these files with it is all
If you can't figure it out on your own or by doing a simple Google search, then Linux is probably not for you and you should look into using a more traditional OS like Windows. Since you're on a Chromebook, your best bet is to get a different device. Sorry, but I'm just saying it like it is. I doubt this would run well, if at all, under Crostini anyways.
I wouldn't say it's useless or unhelpful. I'm simply saying it like it is: Crostini was not made to run games and most games simply will not run with it. If they're not able to figure it out on their own (Linux is an OS where you'll have to figure out a lot of things for yourself), the best option is to use a different OS. Don't get me wrong, I love Chrome OS - my daily driver is a Chromebook! - but it's quite clear that they were not made with the intent of them being used for PC gaming.