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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .253 | Alcatel-Lucent S.A. | Settings Files | Speed Touch DSL Modem Firmware Update | Unknown Software | Unknown Developer |
| .303 | Unknown Developer | Settings Files | Seq-303 Settings Files | Seq-303 | Metaphoric Software |
| .310 | Tri-Sen Systems | Settings Files | Tri-Sen TS310 Controller Configuration File | Tri-Sen TS310 | Tri-Sen Systems |
| .3CN | Microsoft Corporation | Settings Files | 3D Movie Maker Scene Data | 3D Movie Maker | Microsoft Corporation |
| .3FX | Corel | Settings Files | Corel Chart 3D Effect | CorelDRAW Graphics Suite | Corel |
| .3O3 | Metaphoric Software | Settings Files | 3O3 Settings Files | Seq-303 | Metaphoric Software |
| .3TH | Microsoft Corporation | Settings Files | 3D Movie Maker Thumbnail Data File | 3D Movie Maker | Microsoft Corporation |
| .426 | Alcatel-Lucent S.A. | Settings Files | Firewall Firmware Update | Unknown Software | Unknown Developer |
| .4CM | Pitrinec | Settings Files | ClickyMouse Macro Set | ClickyMouse | Pitrinec |
| .4TW | Pitrinec | Settings Files | Macro Toolworks Macro Set | Macro Toolworks | Pitrinec |
| .521 | Murry State University | Settings Files | Murray State University Trojan Ring Configuration File | Trojan Ring | Murry State University |
| .89K | Texas Instruments, Inc. | Settings Files | TI-89 Application File | TI-89 | Texas Instruments, Inc. |
| .89S | Texas Instruments, Inc. | Settings Files | TI-89 Application File | TI-89 | Texas Instruments, Inc. |
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