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How to open .DII files on Windows

To open .DII files on Windows, if you have Summation installed, open the software and use its load/import function to import the Summation (DII) load file (do not rely on double-click).

Step-by-step instructions

  1. If you have Summation installed, open the software and use its load/import function to import the Summation (DII) load file (do not rely on double-click).
  2. If you use Nuix Workstation, import the legal export/load file and select the option for Summation load files when prompted.
  3. To inspect the contents, open the .DII in a plain-text editor to review tags/records (this will not load linked images).

Alternative methods

  • Open .DII in a browser-based viewer if desktop apps fail.
  • Try opening .DII on Windows with a secondary app to rule out app-specific issues.
  • Convert .DII only with trusted tools when direct opening is not possible.

Common issues

Double-clicking opens in the wrong program (or not at all)

A .DII is usually meant to be imported by litigation support/eDiscovery software, so the OS may not know what app to use.

  1. Open your litigation support/eDiscovery application and use its load/import workflow for Summation (DII) load files.
  2. If you only need to inspect it, open it in a text editor to confirm it contains load records and not binary data.

Import fails because referenced images/files are missing

DII commonly references external image/document files; if you only received the .DII, the import cannot resolve those links.

  1. Ask for the complete production package (the image files and any accompanying load/production artifacts) in the original folder structure.
  2. Verify that referenced file paths/filenames in the .DII match what is present on disk before importing.

Records import but fields look misaligned or incorrect

Load formats rely on specific tag/record structures; if the expected structure differs, fields can map incorrectly.

  1. Confirm the receiving tool is set to interpret the file as a Summation load file (DII) format during import.
  2. Open the .DII in a text editor and check whether the tagged structure matches the expected Summation DII specification used by your workflow.

Security note

Treat .DII as untrusted input when it comes from outside your organization: it can contain file paths and references that may cause an import tool to attempt to open unexpected external files.

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