| esi | USoft Application Resources Data |
| esig | HTK Entropic Esignal Format Data |
| esk | eSignal Scan Data |
| eskin | Emperor Media Player Skin 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 | AGTEK Earthwork 3D Data |
| esw | Turbo Smetchik Data |
| esx | Algor Simulation Legacy Model |
| 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 |
| etbl | eTextbookViewer License Data |
| etc | eTreppid Compressed Data |
| etd | Adobe Reader EBX Transfer Data File |
| etex | eTutor Questions Data |
| etff | Encrypt4all Theme Data |
| eti | ETI Stream |
| etn | Telnet98 Session Data |
| eto | AquaCrop Reference Evapotranspiration Data |
| etq | eSignal Time and Quotes Data |
| etr | eTextReader Document |
| etx | Structure Enhanced Text Data |
| ety | ety-python Data |