| top | GROMACS System Topology |
| topx | E-Sword v9 Topic Note |
| tot | LG Phone Rom |
| totalsbackup | Totals Database Backup File |
| totalsdb | Totals Database File |
| tp2 | WeiDU Resource Pack |
| tp5 | MODTRAN Tape 5 Data |
| tp6 | MODTRAN Standard Output File |
| tp7 | MODTRAN Primary Spectral Output |
| tp8 | MODTRAN Spectral Output Data |
| tpa | GROMACS ASCII Input File |
| tpb | GROMACS Binary Input File |
| tpdb8 | ThumbsPlus v8 Thumbnail Database |
| tpe | Clarion Example Database File |
| tped | PLINK Transposed Text Genotype Table |
| tpf | Topocad Profile Form |
| tpl | Trial Sequential Analysis Template |
| tpl | NoteTab Template File |
| tplt | Molly Template |
| tplt | HyperWorks Results Visualization Plot Template |
| tplx | TurningPoint 5 Document |
| tpq | TPWINLOG QSO Log |
| tpr | GROMACS Portable Binary Input File |
| tps | RFM Total Internal Partition Sums File |
| tps | Clarion TopSpeed Database |
| tpsdb | Print Shop Database |
| tpsml | PSML Page Template |
| tpt | PCLTool Transformation Parameter Table |
| tpzu | Treepad Icon Library Update |
| tp_meta | ThumbsPlus Metadata |
| tq | STK Torque File |
| tq5 | TQSL Certificate Request Data |
| tq6 | TQSL Certificate Data |
| tq8 | TQSL Signed Certificate Data |
| tqc | TqcRunas Document |