| .E | OpenEuphoria | Developer Files | Euphoria Include File | Rapid Deployment Euphoria | OpenEuphoria |
| .EAF | Max Planck Institute for Psycholinguistics | Developer Files | ELAN Annotation Format | ELAN | Max Planck Institute for Psycholinguistics |
| .EBC | SourceForge | Developer Files | MediaBASIC Compiled Project | MediaBASIC | SourceForge |
| .EBS | Psychology Software Tools, Inc. | Developer Files | E-Run Version 1 Script File | E-Prime | Psychology Software Tools, Inc. |
| .EBX | IBM | Developer Files | Rational Rose 98 Compiled Script | Rational Rose | IBM |
| .EC | Informix Corporation | Developer Files | Informix ESQL/C Source | IBM Informix | IBM |
| .ECP | Intelitek | Developer Files | EasyC Project File | EasyC | Intelitek |
| .ECT | Yozosoft | Developer Files | Yozo Office Chart Template File | Yozosoft Yozo Office | Yozosoft |
| .EDM | Adobe Systems Incorporated | Developer Files | Adobe Extension Data Markup Language File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .EDML | Adobe Systems Incorporated | Developer Files | Adobe Extension Data Markup Language File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .EDMX | Microsoft Corporation | Developer Files | ADO.NET Entity Data Model Designer File | Microsoft Visual Studio | Microsoft Corporation |
| .EEP | Open Source | Developer Files | EEPROM Data File | HHD Hex Editor | HHD Software |
| .EFD | Parallels | Developer Files | Parallels Desktop Related File | Parallels Desktop for Mac | Parallels |
| .EFG | Open Source | Developer Files | Gambit Extensive Game Format | Gambit | Open Source |
| .EKM | Symbol Dynamics LLC | Developer Files | EXP Macro | EXP | Symbol Dynamics LLC |
| .EL | GNU Project | Developer Files | Emacs Lisp Code File | GNU Emacs | GNU Project |
| .ELA | TradeStation | Developer Files | EasyLanguage Archive | TradeStation | TradeStation |
| .ELC | GNU Project | Developer Files | Emacs Compiled Lisp File | GNU Emacs | GNU Project |
| .ELD | DIAL | Developer Files | Eulumdat Formatted Luminaire Data File | DIAL DIALux | DIAL |
| .ELK | Altium | Developer Files | Altium Designer Linker Error Message | Altium Designer | Altium |
| .EMV | National Instruments | Developer Files | LabVIEW Configuration File | LabVIEW | National Instruments |
| .ENT | Syncro Soft | Developer Files | External Entity | Oxygen XML Editor 19 | Syncro Soft |
| .EPJ | Grass Valley | Developer Files | EDIUS Pro Project File | Thomson EDIUS | Grass Valley |
| .EQN | Altium | Developer Files | GAL Equation File | Altium Designer | Altium |
| .ERB | Open Source | Developer Files | Ruby ERB Script | Microsoft Notepad | Microsoft Corporation |
| .ERL | INCA Internet | Developer Files | GameGuard Error Log File | GameGuard | INCA Internet |
| .ES | Interscape | Developer Files | ECHOSPEECH File | ECHOSPEECH | Interscape |
| .EU | OpenEuphoria | Developer Files | Euphoria Include Data | Rapid Deployment Euphoria | OpenEuphoria |
| .EW | OpenEuphoria | Developer Files | Euphoria Source Code File | Microsoft Notepad | Microsoft Corporation |
| .EX | Symantec Corporation | Developer Files | Norton Ghost Template Data | Symantec Ghost Solution Suite | Symantec Corporation |
| .EXE_ | Open Source | Developer Files | Emu8086 Assembly Source Code | 8086 Microprocessor Emulator | Open Source |
| .EXL | SysTools Solutions | Developer Files | Export Lister File | SysTools Export Notes | SysTools Solutions |
| .EXP | Unknown Developer | Developer Files | Symbols Export File | Microsoft Visual Studio | Microsoft Corporation |
| .EXU | Open Source | Developer Files | Euphoria For Linux Source Code | Euphoria | Open Source |
| .EXW | OpenEuphoria | Developer Files | Euphoria Source Code File | Microsoft Notepad | Microsoft Corporation |
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