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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .1ST | Microsoft Corporation | Text Files | Visual FoxPro Documenting Wizard List | Microsoft Visual FoxPro | Microsoft Corporation |
| .3 | IBM | Text Files | IBM Embedded ViaVoice Voice Type Languages Scripts Data | IBM Embedded ViaVoice | IBM |
| .3T | Global Publishing Solutions | Text Files | Advent 3B2 Text File | Advanced Print Publisher (formerly Advent 3B2) | Global Publishing Solutions |
| .4 | IBM | Text Files | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .4QR | 4D, Inc | Text Files | 4th Dimension Database Windows Quick Report | 4D | 4D, Inc |
| .602 | Milan Broz | Text Files | T602 Text File | T602VW | Milan Broz |
| .660 | Acresso Software, Inc. | Text Files | FLEXnet Manager File | FLEXnet Manager | Flexera Software |
| .89T | Texas Instruments, Inc. | Text Files | TI-89 Text File | TI Connect | Texas Instruments, Inc. |
| .9 | Ubisoft | Text Files | Salt Lake Winter Olympics 2002 Game Music File | Salt Lake 2002 | Ubisoft |
| .9XT | Texas Instruments, Inc. | Text Files | TI-89 Text File | TI Connect | Texas Instruments, Inc. |
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