If your system has a CD player you could always burn them to CD and play. Not as normal files dragged on and burned, but using an app like Nero or similar to burn it as a regular music CD playable anywhere.
music from a thumb drive
I have a rogue audio sphinx v2. I mostly listen to vinyl but occasionally stream via an audioengine by streamer link. I am drifting further away from digital. I was recently given a usb thumb drive with a ridiculous amount of music on it. Live boards of the Allman Bros, Grateful Dead, BB King, ect. I dont plan on expanding my digital collection and do not want to spend $1000-$5000(or more) on a music server that I just will not use. Are there any alternatives for playing that music through my sphinx? Preferably ones that cost under $1000. Thank you in advance. I did wonder if I could use a bluray player?