| erl | Erlang Source Code |
| erlang | Erlang Source Code |
| ers | Altium Designer Assembler Error Messages File |
| erubis | Erubis Script |
| es | ECMAScript Source Code |
| es | Sage CRM Script |
| esav | ANSYS Element Saved Data |
| esk | ESock Module Information |
| esl | Microsoft Visual FoxPro Support Library |
| eto | Visual Studio Enterprise Template Object |
| eu | Euphoria Include File |
| ev3b | Lego Mindstorms EV3 Block File |
| ew | Euphoria Include File |
| ewd | IAR System Debugger Data |
| ewu | Embedded Wizard Unit |
| eww | IAR System Workspace Data |
| ex | Euphoria Source Code |
| ex2 | ParaView EX2 Mesh Data |
| ex4 | MQL4 Compiled Modules |
| ex5 | MetaTrader 5 Program |
| exml | Tizen Effect Model |
| exob | WeintekHMI EasyBuilder Pro Compiled Project |
| exsd | Eclipse Extension Point Schema |
| ext | Visual Studio .NET DB Project Extended Properties |
| exu | Euphoria Source Code |
| exv | Adobe Extension Script |
| exw | Euphoria Source Code |
| ey | Engine Yard Project Configuration |
| ezg | EZGraphs Source Code |
| f | Forth Source Code |
| f | Fortran Source Code |
| f4 | Fortran IV Source Code |
| f77 | Fortran Source Code |
| f90 | Fortran Source Code |
| facefx | FaceFX Actor File |