TeamWin Recovery Project Backup
From Just Solve the File Format Problem
Backups made by TWRP, a custom recovery software. The recomended way to extract is here: https://forum.xda-developers.com/t/app-4-2-noroot-twrp-backup-extractor-decompress-your-twrp-backups-with-a-touch.4096461/ Note this is an android app and needs Windows 11 to use on a PC.
