System Exclusive files for various hardware synthesiers. "Request" files are for requesting data from the synthesiser, typically via a computer app that can send and receive information in one such as:
https://mountainutilities.eu/miditools
(Load relevant .syx file > arm record in "MIDI INPUT MESSAGES" > play .syx request file in "MIDI SYSTEM EXCLUSIVE MESSAGES")