If you're referring to exporting and using the preset, here's some steps for you:
1. Create your preset, make sure all files are named correctly and placed in their ideal folder in Feralheart / my_presets / whatever number preset you're using.
2. Once that's done, head in-game and click on Creative Den on the main title screen, and then Preset Maker.
3. Here, you click on the top bar of the character creator where you'd adjust the colours of the character, and you'll see the presets tab as you do in the main character creation screen.
4. Click on the preset number your preset is under, and if all is well with it, click Export.
5. Once that's done, it'll let you know that it's been exported into Feralheart / presets as a .fhp file.
6. Head in game, click on the preset you want to use, and enjoy.
But I also see you're mentioning the .exe file, which I'm assuming you're talking about FH itself. What kind of troubles are you having when you attempt to open the game? I'm inexperienced with the workings of Chromebook, but I'll try to help best I can with the limited knowledge I've accumulated over the years.