| tlc | Topocad Layer Collection Data |
| tld | PTC Creo Thermal Temperature Load Data |
| tld | TINA Library Descriptor |
| tld | Trellix Document Design Data |
| tle | dpsVelocity Timeline Data |
| tle | STK Two-line Element Sets |
| tlf | Timing Library Format File |
| tlic | ClickOnce Trust License Data |
| tlist | Geomview Transformation Matrices Data |
| tll | LG TV Link-Loader File |
| tlm | Spektrum DX8 Telemetry Log |
| tlm | Timeline Maker Timeline Data |
| tln | HyperLynx LineSim Schematic |
| tlo | SPSS Table Look File |
| tlog | ArduCopter Telemetry Log |
| tlog | Oracle Database Transaction Log |
| tlr | Tableau Offline License Registration Data |
| tlst | GibbsCAM Tool List Data |
| tlsv | Topcon TopSURV Database |
| tlt | AVerMedia AVerTV Go Teletext Data |
| tlt | Topocad Line Table Data |
| tlt | Trellix Web Design Template |
| tlv | TruLASER View Geometry Data |
| tlx | Cardbox User Spelling Dictionary |
| tlx | Catalyst Translation Toolkit Data |
| tlx | CuteSITE Builder Website Data |
| tlx | Technics SX-KN6000 Text Lyrics Data |
| tlx | Trellix Web Design Data |
| tly | Adobe Photoshop Elements Backup Catalog |
| tlz | LZMA Compressed TAR Archive |
