.ei file: how to open it on Windows

3 Windows apps register the .ei extension. Install one of them to open the file with a double-click.

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  XnView MP

  Professional Image Viewer & Photo Management

  Proprietary 1.12.2.0 436.9K ↓
• 
  SageThumbs

  A powerful shell extension allowing to preview enormous amount of image formats directly in Windows Explorer.

  Open source 2.0.0.23 14.6K ↓
• X
  XnView

  Best Photo Viewer, Image Resizer & Batch Converter for Windows.

  Proprietary 2.52.7

Related guide: Change the default app for a file type in Windows