| 71. | .eri | Data (ERWin) |
| 72. | .erm | Bitmap graphics ◊ Entity Relationship Diagram model file (Prosa) |
| 73. | .err | Error log ◊ Error messages for command line compilers |
| 74. | .ers | ER Mapper raster file format (ArcView) ◊ Satellite image header (ER Mapper satellite image analysis) (Earth Resource Mapping) |
| 75. | .erx | Data (ERWin) |
| 76. | .es~ | EPOC Synchronization file |
| 77. | .esf | Audio file (Emblaze) |
| 78. | .esh | Extended Shell batch file |
| 79. | .esl | Distributable support library (Microsoft Visual FoxPro) |
| 80. | .esps | Sound (ESPS audio file) |
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