How to play cave story on Xbox One
1. Setup Target Xbox One
To setup your Xbox One you must install dev mode activation. Dev mode activation app can be found in the windows store on your Xbox One. Dev mode activation will tell you what to do. When you are finished setting up your Xbox one you can launch developer mode. Better instructions are found here:
https://docs.microsoft.com/en-us/windows/uwp/xbox-apps/devkit-activation
2. Install ppsspp on the Xbox One
On on your Xbox one running developer mode go to the square in the bottom right corner and click on settings (the square has your consoles IP address in it). Get the link from the settings tab and enter the link into a computer. On your computer download ppsspp for the Xbox One from this website-
https://mega.nz/#!ps9TTICT!t8AifH2iR9VbhnTzx-wXK3OYH3Obiamxnx36Wbcv5T0 | Once you've downloaded the file go back to the website and upload the ppsspp file with the "add" button. Ppsspp should begin to install.
3. Import and play Cave Story!
On the Xbox One go into settings, then display and sound, and then video output and make sure apps can't make a border. Then go to your computer and insert a usb drive. Copy the Cave Story rom to the root of the flash drive and the eject it and plug it into your Xbox One. Then launch ppsspp. In ppsspp click load then go into your usb drive and chose your rom. Launch the rom.
4. Fix the controls
On the cave story menu use the B button to click on items. It will bring up the ppsspp in game menu. If you click exit on the menu the item you clicked on in the Cave Story menu will be pressed on. In the keys menu configure the controls then launch the game!
5. Play Cave Story!
Do I need to say anymore? Nah. If I left anything out please tell me.