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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .83S | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .83SD | Texas Instruments, Inc. | Data Files | TI-83 Plus Silver Edition Debugger File | TI-83 | Texas Instruments, Inc. |
| .83T | Texas Instruments, Inc. | Data Files | TI-83 Calculator Table Setup | TI Connect | Texas Instruments, Inc. |
| .83Y | Texas Instruments, Inc. | Data Files | TI-83 Calculator Equation Data | TI Connect | Texas Instruments, Inc. |
| .850 | Microsoft Corporation | Data Files | Visual FoxPro 98 Data | Microsoft Visual FoxPro | Microsoft Corporation |
| .852 | Microsoft Corporation | Data Files | Visual FoxPro 98 Data | Microsoft Visual FoxPro | Microsoft Corporation |
| .85B | Texas Instruments, Inc. | Data Files | TI-85 Data File | TI Connect | Texas Instruments, Inc. |
| .85N | Texas Instruments, Inc. | Data Files | TI-85 Data File | TI Connect | Texas Instruments, Inc. |
| .85R | Texas Instruments, Inc. | Data Files | TI-85 Data File | TI Connect | Texas Instruments, Inc. |
| .85Y | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .86 | PTC | Data Files | Creo Elements/Pro Versioned Data | Pro/ENGINEER | PTC |
| .866 | Microsoft Corporation | Data Files | Visual FoxPro 98 Data | Microsoft Visual FoxPro | Microsoft Corporation |
| .86C | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .86D | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .86E | Texas Instruments, Inc. | Data Files | TI-86 File | TI Connect | Texas Instruments, Inc. |
| .86K | Texas Instruments, Inc. | Data Files | TI-86 Constant File | TI-83 | Texas Instruments, Inc. |
| .86L | Texas Instruments, Inc. | Data Files | TI-86 File | TI Connect | Texas Instruments, Inc. |
| .86M | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .86P | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .86R | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .86S | Texas Instruments, Inc. | Data Files | TI-86 String | TI-86 | Texas Instruments, Inc. |
| .86V | Texas Instruments, Inc. | Data Files | TI-86 File | TI Connect | Texas Instruments, Inc. |
| .86W | Texas Instruments, Inc. | Data Files | TI-86 Window Setup File | TI-86 | Texas Instruments, Inc. |
| .87 | PTC | Data Files | Creo Elements/Pro Versioned Data | Pro/ENGINEER | PTC |
| .89 | PTC | Data Files | Creo Elements/Pro Versioned Data | Pro/ENGINEER | PTC |
| .89A | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .89B | Texas Instruments, Inc. | Data Files | TI-89 Data File | TI Connect | Texas Instruments, Inc. |
| .89C | Texas Instruments, Inc. | Data Files | TI-89 Data File | TI Connect | Texas Instruments, Inc. |
| .89D | Texas Instruments, Inc. | Data Files | TI-89 Graphic Database | TI Connect | Texas Instruments, Inc. |
| .89E | Texas Instruments, Inc. | Data Files | TI-89 Expression File | TI Connect | Texas Instruments, Inc. |
| .89F | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .89G | Texas Instruments, Inc. | Data Files | TI-89 Group File | TI-83 | Texas Instruments, Inc. |
| .89M | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .89N | Texas Instruments, Inc. | Data Files | TI-89 Data File | TI Connect | Texas Instruments, Inc. |
| .89P | Texas Instruments, Inc. | Data Files | TI-89 Calculator Program | TI Connect | Texas Instruments, Inc. |
| .89R | Texas Instruments, Inc. | Data Files | TI-89 Data File | TI Connect | Texas Instruments, Inc. |
| .89U | Texas Instruments, Inc. | Data Files | TI-89 System Update File | TI Connect | Texas Instruments, Inc. |
| .89Y | Texas Instruments, Inc. | Data Files | TI-89 Plus Data File | TI-89 | Texas Instruments, Inc. |
| .89Z | Texas Instruments, Inc. | Data Files | TI-89 Program/Graphic | TI Connect | Texas Instruments, Inc. |
| .8A | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .8B | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .8BW | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .8T | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .8XB | Texas Instruments, Inc. | Data Files | TI Connect File | TI Connect | Texas Instruments, Inc. |
| .8XG | Texas Instruments, Inc. | Data Files | TI-83/84 Plus Group File | TI-83 | Texas Instruments, Inc. |
| .8XK | Texas Instruments, Inc. | Data Files | TI-83 Plus Application Upgrade File | TI-83 | Texas Instruments, Inc. |
| .8XL | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .8XM | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .8XN | Texas Instruments, Inc. | Data Files | TI-83/84 Plus Number Data | TI Connect | Texas Instruments, Inc. |
| .8XQ | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .8XT | Texas Instruments, Inc. | Data Files | TI-83/84 Plus Table Setup | TI Connect | Texas Instruments, Inc. |
| .8XV | Texas Instruments, Inc. | Data Files | TI-83/84 Plus Variable File | TI-83 | Texas Instruments, Inc. |
| .8XY | Texas Instruments, Inc. | Data Files | TI-83/84 Plus App Variable Data | TI Connect | Texas Instruments, Inc. |
| .9 | Ubisoft | Data Files | Salt Lake Winter Olympics 2002 Game Music File | Salt Lake 2002 | Ubisoft |
| .90 | PTC | Data Files | Creo Elements/Pro Versioned Data | Pro/ENGINEER | PTC |
| .900 | Network Computing Devices | Data Files | NCBridge NC900 Boot Software Data | NC900 | Network Computing Devices |
| .912 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .917 | Trend Micro | Data Files | Trend Antivirus Data | Trend Micro Antivirus | Trend Micro |
| .92 | PTC | Data Files | Creo Elements/Pro Versioned Data | Pro/ENGINEER | PTC |
| .92A | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .92F | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .92G | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .92K | Texas Instruments, Inc. | Data Files | TI-92 Application | TI Connect | Texas Instruments, Inc. |
| .92L | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .92M | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .92P | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .92R | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .92Y | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .92Z | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .93 | PTC | Data Files | Creo Elements/Pro Versioned Data | Pro/ENGINEER | PTC |
| .94 | PTC | Data Files | Creo Elements/Pro Versioned Data | Pro/ENGINEER | PTC |
| .95 | PTC | Data Files | Creo Elements/Pro Versioned Data | Pro/ENGINEER | PTC |
| .97 | PTC | Data Files | Creo Elements/Pro Versioned Data | Pro/ENGINEER | PTC |
| .97T | Unknown Developer | Data Files | Availity Health Information Network File | Unknown Software | Unknown Developer |
| .98 | PTC | Data Files | Creo Elements/Pro Versioned Data | Pro/ENGINEER | PTC |
| .99 | PTC | Data Files | Creo Elements/Pro Versioned Data | Pro/ENGINEER | PTC |
| .9A | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .9T | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .9XB | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .9XE | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .9XF | Texas Instruments, Inc. | Data Files | Texas Instruments TI-92 Plus Function | TI Connect | Texas Instruments, Inc. |
| .9XK | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .9XL | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .9XM | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .9XN | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .9XP | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .9XQ | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .9XU | Texas Instruments, Inc. | Data Files | TI-92 OS Update | TI Connect | Texas Instruments, Inc. |
| .9XX | Texas Instruments, Inc. | Data Files | TI Connect Data | TI Connect | Texas Instruments, Inc. |
| .9XY | Texas Instruments, Inc. | Data Files | TI-92 Plus Data File | TI Connect | Texas Instruments, Inc. |
| .A2 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .A3 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .A3L | Adobe Systems Incorporated | Data Files | Authorware 3 Library | Adobe Authorware | Adobe Systems Incorporated |
| .A3M | Adobe Systems Incorporated | Data Files | Authorware 3 Macintosh File | Adobe Authorware | Adobe Systems Incorporated |
| .A3W | Adobe Systems Incorporated | Data Files | Authorware 3 Windows File | Adobe Authorware | Adobe Systems Incorporated |
| .A4L | Adobe Systems Incorporated | Data Files | Authorware 4 Library | Adobe Authorware | Adobe Systems Incorporated |
| .A4M | Adobe Systems Incorporated | Data Files | Adobe Authorware Unpackaged File | Adobe Authorware | Adobe Systems Incorporated |
| .A4P | Avanquest Software | Data Files | A4Desk Pro Project File | Avanquest A4Desk Pro | Avanquest Software |
| .A4R | Adobe Systems Incorporated | Data Files | Adobe Authorware Package Course Data | Adobe Authorware | Adobe Systems Incorporated |
| .A4W | Adobe Systems Incorporated | Data Files | Authorware 4 Windows File | Adobe Authorware | Adobe Systems Incorporated |
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