Unfortunately, when it comes to Linux/Chromium-based operating systems, running applications like Feral Heart isn't possible without the use of WINE or a similar application. That being said, using WINE or a similar application will allow you to actually open the game. Specifically for ChromeOS, I did some digging and found this post on the forum that might help you further: https://feral-heart.com/smf/index.php?topic=65543.0
From there, once you've got that setup and working, should be able to load up the preset under Tools on the main menu, and export it.
Good luck
Thank you, I have been playing for a while now with this, despite some loading problems. I just have to keep playing I guess. It works fine I just need to figure out how to open the feral heart file, place the images in preset_3 and then I can go into tools and do that. The feral heart file is an exe file so that's why I'm having trouble with it. Can you find a way for me to open or read an exe file.