GMC Yukon Owner's Manual page 329

CD R or CD RW Supported File and Folder
Structure
The DVD Player supports:
Up to 255 folders.
Up to 8 folders in depth.
Up to 15 playlists.
Up to 40 sessions.
Playlists with an .m3u or .wpl extension.
Files with an .mp3, .wma, or .cda file extension.
The CD Player supports:
Up to 512 files and folders.
Up to 8 folders in depth.
Playlists with an .m3u or .wpl extension.
Files with an .mp3, .wma, or .cda file extension.
USB Supported File and Folder Structure
The radio supports:
Up to 700 folders.
Up to 8 folders in depth.
Up to 65,535 files.
Folder and file names up to 64 bytes.
Files with an .mp3 or .wma file extension.
AAC files stored on an iPod.
FAT16
FAT32
Root Directory
The root directory of the disc is treated as a folder. If the
root directory has compressed audio files, the directory
displays as F1 ROOT on the radio.
If a disc contains both uncompressed CD audio and
MP3/WMA files, a folder under the root directory called
CD accesses all of the CD audio tracks on the disc.
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