Hello,
I don't use this format on a USB stick. Only MP3. I'll see if I can do a test, but I'm not there yet.
Other feedback, out of the question:
I'm very disappointed with the CD part. Given the price and weight of this device, it's no real surprise.
The DAB radio does the job.
I've just moved house... DAB sensitivity is average.
It also lacks a few millimetres to be aligned with Hifi components! Ex. Hartman,/Karon.
I would not buy this radio again.

Hello
I've never tried this before. But I don't think that this is directly possible. But there are many programs that can be used to convert a wide variety of audio and video files. The TechniSat user manual states the following:
USB music playback
Supported music files (MP3) on a USB mass storage device can be played back on the DIGITRADIO 143 CD. Plug in
for this purpose, the USB mass storage device, e.g. a USB stick to the USB socket (3) on the front of the DIGITRADIO 143 CD.