| tac | ActiCalc Data |
| tac | JSim Time Activity Curve Data |
| tacx | Tacx Exported Training Data |
| tad | TA Orchestrator Data |
| taf | ADRIFT Text Adventure File |
| taf | IBM Rational ClearCase Transaction Data |
| tag | COREX Tag Data |
| tag | DataFlex Query Tag |
| tags | abcAVI Tag Editor Tags Data |
| tai | Nvidia Texture Atlas Tool Texture Data |
| tajima | Tajima Embroidery Data |
| tak | Music Maker Audio Sample |
| tal | BrainVoyager QX Talairach Coordinates |
| talf | Content Manager Audit Log |
| tan | RFM Tangent Altitudes File |
| tap | GSM Transferred Account Procedure Data |
| tap | ZX Spectrum Emulator Tape Data TAP |
| tap3 | Transferred Account Procedure v3 Data |
| tape | TapeCalc Tape Data |
| tapesrcmdl | Softimage Tape Source Model |
| tar-lzma | LZMA Compressed TAR Archive |
| tarc | TrakAxPC Data |
| tas | ADRIFT Text Adventure Save |
| tat | Topocad Attributes Data |
| tav | TIGR Array Viewer Format Data |
| tavg | POP Time-averaged History Data |
| tax | Intuit TurboTax Data |
| tax | TaxExpert Database |
| tax08 | Intuit TurboTax 2008 Tax Return Data |
| tax09 | Intuit TurboTax 2009 Tax Return Data |
| tax10 | Intuit TurboTax 2010 Tax Return Data |
| tax11 | Intuit TurboTax 2011 Tax Return Data |
| tax12 | Intuit TurboTax 2012 Tax Return Data |
| tax13 | Intuit TurboTax 2013 Tax Return Data |
| tax14 | Intuit TurboTax 2014 Tax Return Data |
