| tz | Compressed Tape Archive |
| tzb | TAR.Z.btoa Compressed Archive |
| tzip | Tzip Compressed Text |
| tzp | TrueZIP Ecnrypted JAR Archive |
| tzr | ANSYS IcePak Project Package |
| tzst | Zstandard Compressed TAR Archive |
| tzx | Unraid OS Application Package |
| uar | Uniface Deployment Archive |
| uas | PhotoImpact Backup Archive |
| uc2 | UltraCompressor 2 Compressed Archive |
| ucas | Unreal Engine 4 Archive |
| uea | Protector Suite QL Encrypted Archive |
| ueed | Uconomix Encryption Engine Encrypted Directory |
| ueef | Uconomix Encryption Engine Encrypted File |
| uexp | UE Viewer Package |
| ufa | UFA Compressed Archive |
| uha | UHarc Archive |
| uharc | UHarc Archive |
| ums | Dragon UnPACKer 5 Archive |
| upx | UPX Compressed File |
| ustar | Tape Archive |
| uti | PrivateCrypto Encrypted Archive |
| utoc | Unreal Engine 4 Archive Metadata |
| uws | UniTrader 2006 Website Archive |
| uwt | UniTrader Website Template Archive |
| uze | UltimateZip Compressed Archive |
| uzip | FreeBSD Compressed Disk Image |
| vad | Virtuoso Application Distribution Package |
| varc | Havok Vision Engine Archive |
| vbk | Veeam Full Backup Archive |
