ZapDissaster/smp2mp3 ? reverse-engineered prompt

Build me a simple Windows app for working with audio files used by audiocubes.

I want to be able to pick a single audio file or a whole folder, then encrypt or decrypt the files with the same kind of XOR based .smp format these cubes use. It should also let me play an encrypted file directly without having to decrypt it first.

Please include a way to create tag files for the different cube formats, like .mct files for Mifare Classic Tools and .csv files for NXP TagWriter, so I can write RFID tags for supported devices. I also want a small settings area where I can load and save keys, choose the hex key, and control the bit rotation before or after encryption.

It would be great if the app could switch languages using .lan files and work as a portable program with no installer needed. If anything is unclear, look up current docs online if you need to.