| tda | Palm To-Do Archive |
| tda3mt | DivX Author Template |
| tdata | Tome Editor Data |
| tdb | Act! Transaction Database |
| tdb | Intuit QuickBooks Timer Data |
| tdb | SlamDB Database |
| tdc | Tableau Data-connection Customization File |
| tddd | Imagine 3D Data Description File |
| tde | Tableau Data Extract |
| tdf | DVD X Copy TDF File |
| tdf | Guide Text Definition File |
| tdf | MicroSim PCBoard NC Drill Tool Definition |
| tdf | TTDAlter Data |
| tdf | XTrans Data |
| tdh | Borland Turbo Debugger Help Data |
| tdo | Xilinx Text Design Output |
| tdp | Serif DrawPlus Thumbnail |
| tdr | Keysight PLTS TDR Calibration Data |
| tdr | Medlin Payroll Software Tax Deposit Record |
| tdr | TINA Diagram Results |
| tds | Tableau Data Source |
| tdsx | Tableau Packaged Data Source |
| tdt | PLINK Transmission Disequilibrium Test Report |
| tdt | THOR Datatree File |
| tdt1 | AACS Thumbnail Data File |
| tdt2 | AACS Thumbnail Data File |
| tdump | JIRA Thread Dump |
| tdv | NI Diadem Layout |
| tdx | NI Diadem TDX Data |
| te | Textease Database CT Single-user Database |
