That's easy. From a command prompt, type

DIR *.MGU

This command already defaults to a listing by filename in alpha order, ascending. It is short for

DIR *.MGU /ON

And if you want them in alpha order descending, type

DIR *.MGU /O-N

And if you want to learn why,

DIR /?


BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.