| ero | eLibrary Reader Object |
| err | Error Log File |
| ersx | Eraser Scheduled Task List |
| es | E-Prime E-Studio 1.x Experiment File |
| es2 | E-Prime E-Studio 2.x Experiment File |
| esb | Es-Builder Book |
| escopy | ES Explorer Temporary File |
| esd | Algor SuperDraw 3 Data |
| ese | Millions Email Generator Email List |
| ese2 | EDIUS Seek Information Data |
| esf | Steganos Password Manager Container File |
| esform | EasySurveyor Form Data |
| esi | USoft Application Resources Data |
| esig | HTK Entropic Esignal Format Data |
| esk | eSignal Scan Data |
| eslock | ES File Explorer Encrypted Data |
| esn | Windows XP Cache Data |
| eso | EnergyPlus Simulation Output |
| esobi | NewsXpresso Data |
| esp | ACD/Labs Dataset |
| espass | Electronic smartPass Data |
| esr | 4D Database External |
| est | Streets & Trips Map Data |
| estg | STAR-CCM+ Geometry File |
| esw | Turbo Smetchik Data |
| esw | AGTEK Earthwork 3D Data |
| esx | Xactimate Insurance Claims Estimate |
| esz | AGTEK Zipped ESW Data |
| et | Easiteach Lesson |
| et1 | ENERGY-10 Weather Data |
| etb | Micro Focus Extra! Toolbars Data |
| etb | Project Pluto Guide Event Table |
| etb2 | Timbuktu Pro Resource Data |
| etc | eTreppid Compressed Data |
| etd | Adobe Reader EBX Transfer Data File |