| tczip | Tekla Structures Exported Data |
| tczl | Tiny Core Linux Xlib |
| tda | Palm To-Do Archive |
| tda3mt | DivX Author Template |
| tdata | Tome Editor Data |
| tdb | Act! Transaction Database |
| tdb | Complete Works Database |
| tdb | Deja Vu Terminology Database |
| tdb | eBay Turbo Lister Backup Data |
| tdb | Intuit QuickBooks Timer Data |
| tdb | SlamDB Database |
| tdb | TACT Database |
| tdc | Tableau Data-connection Customization File |
| tddd | Imagine 3D Data Description File |
| tde | Tableau Data Extract |
| tdf | Autodesk AutoCAD Civil 3D Template Control Definition |
| tdf | DVD X Copy TDF File |
| tdf | Guide Text Definition File |
| tdf | MicroSim PCBoard NC Drill Tool Definition |
| tdf | Project Pluto Guide Text Definition Data |
| tdf | TTDAlter Data |
| tdf | Xserve Test Definition Data |
| tdf | XTrans Data |
| tdh | Borland Turbo Debugger Help Data |
| tdl | Train Depot Track Designer Data |
| tdn | TreeDBNotes Database |
| tdo | Xilinx Text Design Output |
| tdp | Serif DrawPlus Thumbnail |
| tdr | Keysight PLTS TDR Calibration Data |
| tdr | Medlin Payroll Software Tax Deposit Record |
