Hey thanks for that! Much appreciated.
I'm pretty lost in the Linux world, so it took me a bit of time to figure out how to get it running. But yeah, you'd need to save it as text with a .sh extension.
So hopefully the steps should just be:
1. Rename the "whiplashtaxi" file to "whiplashtaxi.aarch64".
2. Find the PortMaster folder on your device (e.g. /share/roms/ports).
3. Create a subfolder named "taxi" and copy in the files.
4. In the main PortMaster folder save the above script as "Taxi.sh" (or whatever name you want it to appear as in the UI).
5. Update your gamelist in the frontend UI.
Then (hopefully) it should appear in your "Ports" folder.
If it has trouble running, it *may* be necessary to set the executable flag on "whiplashtaxi.aarch64" and/or the .sh file - which might involve invoking a linux shell and running:
chmod +x filename