| .DZP | CyberLink | Pliki z danymi | DirectorZone Particle Effect File | CyberLink PowerDirector 15 Ultra | CyberLink |
| .D_3 | Unknown Developer | Pliki z danymi | Polytext Ma'archot Meida Co. S"TaM | Unknown Software | Unknown Developer |
| .E2C | NJStar Software | Pliki z danymi | NJStar Chinese Word Processor Dictionary File Index | NJStar Chinese WP | NJStar Software |
| .E2P | Open Source | Pliki z danymi | PonyProg Device File | PonyProg | Open Source |
| .E32 | Jordan Russell | Pliki z danymi | Inno Setup 1.3 Data | Inno Setup | Open Source |
| .EAC | Emurasoft, Inc. | Pliki z danymi | EmEditor Auto-Completion Data | EmEditor | Emurasoft, Inc. |
| .EAP | Sparx Systems | Pliki z danymi | Enterprise Architect Project | Enterprise Architect | Sparx Systems |
| .EAS | Rockwell Automation Inc. | Pliki z danymi | RSLogix Symbol File | RSLogix 5 | Rockwell Automation Inc. |
| .EATF | Apple | Pliki z danymi | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .EAZ | ESRI (Environmental Systems Research Institute) | Pliki z danymi | ArcGIS Explorer Add-in File | Microsoft Visual Studio | Microsoft Corporation |
| .EBB | Metapraxis | Pliki z danymi | Empower Business Bulletin Data File | Empower | Metapraxis |
| .EBC | SourceForge | Pliki z danymi | MediaBASIC Compiled Project | MediaBASIC | SourceForge |
| .EBD | Microsoft Corporation | Pliki z danymi | Windows EBD System File | Microsoft Windows | Microsoft Corporation |
| .EBF | Microsoft Corporation | Pliki z danymi | Pocket PC WindowsCE Form | Microsoft Windows CE Embedded | Microsoft Corporation |
| .EBH | Robert Bentley, Inc. | Pliki z danymi | eBahn Desktop Automotive Repair Information Data File | eBahn Desktop | Robert Bentley, Inc. |
| .EBP | Jes-Soft | Pliki z danymi | Jes-Soft Sports Play Description | Jes-Soft Playbook | Jes-Soft |
| .EBUILD | Gentoo Foundation, Inc. | Pliki z danymi | Portage eBuild Script | Gentoo Portage | Gentoo Foundation, Inc. |
| .EBV | ASH WARE | Pliki z danymi | Ash Ware Enhanced Behavior Data | Unknown Software | Unknown Developer |
| .EBX | IBM | Pliki z danymi | Rational Rose 98 Compiled Script | Rational Rose | IBM |
| .EC3 | Epson US | Pliki z danymi | EPSON Print CD File | EPSON Print CD | Epson US |
| .ECC | Carsten Gnörlich | Pliki z danymi | Dvdisaster Error Correction File | dvdisaster | Carsten Gnörlich |
| .ECF | Microsoft Corporation | Pliki z danymi | Outlook Add-in | Microsoft Outlook | Microsoft Corporation |
| .ECG | Open Source | Pliki z danymi | Electrocardiography Data | FreeECG | Open Source |
| .ECH | SourceForge | Pliki z danymi | EasyChem Saved Data | EasyChem | SourceForge |
| .ECL | Team Shanghai Alice | Pliki z danymi | Touhou Stage Script | Touhou ToolKit | Touhou Patch Center |
| .ECP | Intelitek | Pliki z danymi | EasyC Project File | EasyC | Intelitek |
| .ECT | Yozosoft | Pliki z danymi | Yozo Office Chart Template File | Yozosoft Yozo Office | Yozosoft |
| .EDD | Adobe Systems Incorporated | Pliki z danymi | Adobe FrameMaker Element Definition Document File | Adobe FrameMaker | Adobe Systems Incorporated |
| .EDF | ESRF | Pliki z danymi | ESRF Data File | SAXS Program Package | ESRF |
| .EDG | Pacestar Software | Pliki z danymi | Edge Diagrammer File | Pacestar Edge Diagrammer | Pacestar Software |
| .EDH | MindWare Technologies | Pliki z danymi | HRV Edit Data | Heart Rate Variability (HRV) Analysis Software | MindWare Technologies |
| .EDI | Unknown Developer | Pliki z danymi | Electronic Data Interchange File | Microsoft Excel | Microsoft Corporation |
| .EDP | National Instruments | Pliki z danymi | NI Multisim Data | NI Multisim | National Instruments |
| .EDPI | PrestoSoft LLC | Pliki z danymi | ExamDiff Pro Session File | ExamDiff Pro | PrestoSoft LLC |
| .EDT | Adobe Systems Incorporated | Pliki z danymi | Adobe eBook Download Settings | Adobe Digital Editions | Adobe Systems Incorporated |
| .EEG | Compumedics Neuroscan | Pliki z danymi | EEG Data File | Neuroscan Curry | Compumedics Neuroscan |
| .EEP | Open Source | Pliki z danymi | EEPROM Data File | HHD Hex Editor | HHD Software |
| .EER | Lahey Computer Systems, Inc. | Pliki z danymi | Lahey Fortran Error Data | Lahey Fortran | Lahey Computer Systems, Inc. |
| .EF | Blackboard Collaborate | Pliki z danymi | Diploma Exam File | Wimba Diploma | Blackboard Collaborate |
| .EFC | Unknown Developer | Pliki z danymi | EFCoins File | Unknown Software | Unknown Developer |
| .EFP | Microsoft Corporation | Pliki z danymi | Exchange Forms Designer Template | Microsoft Exchange Server | Microsoft Corporation |
| .EFS | ESRI | Pliki z danymi | ESRI Spatial Binary File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .EFT | Cay Horstmann | Pliki z danymi | ChiWriter High Resolution Screen Font | ChiWriter | Cay Horstmann |
| .EFX | j2 Global, Inc. | Pliki z danymi | eFax Document | j2 Global Communications eFax | j2 Global, Inc. |
| .EGB | Encog Machine Learning Framework | Pliki z danymi | Encog Binary Data | Encog Machine Learning Framework | Encog Machine Learning Framework |
| .EGF | CSC - IT Center for Science | Pliki z danymi | Elmer Front Geometry Definition Data | Elmer Front | CSC - IT Center for Science |
| .EGP | Edline | Pliki z danymi | Easy Grade Pro Gradebook File | Edline Easy Grade Pro | Edline |
| .EGR | Crestron Electronics | Pliki z danymi | Crestron Studio Engraver Document File | Crestron Studio | Crestron Electronics |
| .EGT | EagleGet | Pliki z danymi | EagleGet Temporary File | EagleGet | EagleGet |
| .EGV | Canon Inc. | Pliki z danymi | Canon Easy Guide Viewer File | Canon Easy Guide Viewer | Canon Inc. |
| .EIA | Excellon Automation | Pliki z danymi | Excellon Data | Microsoft Notepad | Microsoft Corporation |
| .EID | IBM | Pliki z danymi | IBM Voice Type Languages Newuser File | IBM Voice Type | IBM |
| .EIF | Envex Solutions | Pliki z danymi | Envex Import Format File | xFlow | Envex Solutions |
| .EIO | Yozosoft | Pliki z danymi | Yozo Office File | Yozosoft Yozo Office | Yozosoft |
| .EIS | Synthesoft, Inc. | Pliki z danymi | EIS Spectrum Analyser Project | CD/Spectrum Pro | Synthesoft, Inc. |
| .EKA | Borland | Pliki z danymi | Eureka Internal Data File | Unknown Software | Unknown Developer |
| .EKB | ZMC | Pliki z danymi | ZMC Visual Tablet Data | ZMC VisualTablet for AutoCAD | ZMC |
| .EKR | EEG Store | Pliki z danymi | EEGer Data | EEGer | EEG Store |
| .EKS | Metapraxis | Pliki z danymi | Metapraxis Empower Data File | Empower | Metapraxis |
| .EL | GNU Project | Pliki z danymi | Emacs Lisp Code File | GNU Emacs | GNU Project |
| .EL2 | Canon Inc. | Pliki z danymi | Easy-PhotoPrint EX Sticker File | Easy-PhotoPrint EX | Canon Inc. |
| .EL3 | Canon Inc. | Pliki z danymi | Canon Easy-PhotoPrint EX File | Easy-PhotoPrint EX | Canon Inc. |
| .ELC | GNU Project | Pliki z danymi | Emacs Compiled Lisp File | GNU Emacs | GNU Project |
| .ELD | DIAL | Pliki z danymi | Eulumdat Formatted Luminaire Data File | DIAL DIALux | DIAL |
| .ELG | Energy Scitech Limited | Pliki z danymi | Enable Activity Log | ENABLE Software | Energy Scitech Limited |
| .ELI | Novarm | Pliki z danymi | DipTrace Data | DipTrace | Novarm |
| .ELL | Advanced Micro Devices, Inc. | Pliki z danymi | AMD ATI Radeon Video Driver | ATI Multimedia Center | Advanced Micro Devices, Inc. |
| .ELN | Blackboard Collaborate | Pliki z danymi | Blackboard Collaborate Note Document | Unknown Software | Unknown Developer |
| .ELOG | McAfee, Inc. | Pliki z danymi | McAffee Firewall Log File | McAfee Internet Security | McAfee, Inc. |
| .ELP | Open Source | Pliki z danymi | eXe Learning Package File | eXeLearning | Open Source |
| .ELS | TradeStation | Pliki z danymi | EasyLanguage Storage File | EasyLanguage | TradeStation |
| .ELSEWHERE | Unknown Developer | Pliki z danymi | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .ELT | NEPLAN AG | Pliki z danymi | NEPLAN Topology Data | NEPLAN Electricity | NEPLAN AG |
| .EMAT | ANSYS, Inc. | Pliki z danymi | ANSYS Element Matrix File | ANSYS DesignModeler | ANSYS, Inc. |
| .EMB | Everest Software | Pliki z danymi | Everest Embedded Bank File | Awave Studio | FMJ-Software |
| .EMBL | European Molecular Biology Laboratory (EMBL) | Pliki z danymi | EMBL Sequence Data File | DNASTAR Lasergene | DNASTAR |
| .EMD | FMJ-Software | Pliki z danymi | ABT Extended Module File | Awave Studio | FMJ-Software |
| .EMP | Open Source | Pliki z danymi | eMusic Music Download File | eMusic/J | Open Source |
| .EMS | Intergraph Corporation | Pliki z danymi | Intergraph Engineering Modelling System File | Unknown Software | Unknown Developer |
| .ENB | Open Source | Pliki z danymi | eNotebook Notebook File | eNotebook | Open Source |
| .ENC | Smith Micro Software | Pliki z danymi | Encoded Data File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .END | Corel | Pliki z danymi | CorelDRAW Arrow-head Definition Data | CorelDRAW Graphics Suite | Corel |
| .ENE | KTH Royal Institute of Technology | Pliki z danymi | GROMACS Binary Energy File | Gromacs | KTH Royal Institute of Technology |
| .ENG | Unknown Developer | Pliki z danymi | Chess Engine | ChessMaster | Ubisoft Blue Byte |
| .ENH | Open Source | Pliki z danymi | CRiSP Harvest Model Enhancement File | CRiSP Harvest | Open Source |
| .ENL | Thomson Reuters Corporation | Pliki z danymi | EndNote Library | EndNote | Thomson Reuters Corporation |
| .ENM | e-undertown | Pliki z danymi | Enewsletter Manager Message File | eNewletter Manager | e-undertown |
| .ENS | Thomson Reuters Corporation | Pliki z danymi | EndNote Style File | EndNote | Thomson Reuters Corporation |
| .ENV | Adobe Systems Incorporated | Pliki z danymi | Adobe Dictionary Data File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ENX | IBM | Pliki z danymi | IBM Rational XDE Data | Rational XDE | IBM |
| .EON | EON Reality | Pliki z danymi | EON Studio File | EON Studio | EON Reality |
| .EOP | Everyone Piano Inc. | Pliki z danymi | EveryonePiano Music Score File | Everyone Piano | Everyone Piano Inc. |
| .EOT | Microsoft Corporation | Pliki z danymi | Embedded OpenType Font | Web Embedding Fonts Tool (WEFT) | Microsoft Corporation |
| .EOX | EON Reality | Pliki z danymi | EON Studio Project | EON Studio | EON Reality |
| .EOZ | EON Reality | Pliki z danymi | EON Studio File | EON Studio | EON Reality |
| .EPB | WebWorks | Pliki z danymi | ePublisher File | ePublisher | WebWorks |
| .EPC | Sumo Digital Ltd. | Pliki z danymi | Doctor Who Game Data File | BBC Doctor Who: The Adventure Games | Sumo Digital Ltd. |
| .EPF | Vero Software | Pliki z danymi | Edgecam Educational Part File | Planit Edgecam | Vero Software |
| .EPJ | Grass Valley | Pliki z danymi | EDIUS Pro Project File | Thomson EDIUS | Grass Valley |
| .EPL | Open Source | Pliki z danymi | Tallyman E-commerce Software File | TallyMan | Open Source |
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