WinUAE --> Amiga emulator

try installing WinUAE on to the flash drive. Maybe it's portable already?

As near as I can tell all the files are inside the WinUAE folder.

If you add a empty file called winuae.ini and that turns WinUAE in to a portable app

To create a file on any windows since 2000, run this code in the commandline ([win]+r, "cmd"):
echo > ?:\winuae.ini
replace ? with the letter of your flashdrive
Now you can move the file next to the winuae binary.