| tka | Genie 2000 Measurements Data |
| tkb | TicketBench Data |
| tkc | MetaTrader 5 Tick Data |
| tkd | Wikit TKD Database |
| tkfl | TKLinks Saver Favorite Links |
| tki | Tkined Data |
| tkined | Tkined Configuration Data |
| tkr | eSignal Ticker Data |
| tks | NI Traktor Pro MIDI Map |
| tkt | TK Solver Data |
| tkw | TK Solver Data File |
| tkx | TK Solver Package |
| tl5 | Timeliner 5 Data |
| tlb | HP OpenVMS Text Library |
| tlb | Portfolio Automation Interface Data |
| tlb | TrialDirector Toolbar Data |
| tlb | VAX Text Library |
| tlbackup | True Launch Bar Settings Backup |
| tlbbackup | True Launch Bar Settings Backup |
| tlbplugin | True Launch Bar Plugin |
| tlc | TINA Logic Converter Data |
| 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 |
