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How to open .MDI files on Windows

To open .MDI files on Windows, try opening the .MDI file with Microsoft Office Document Imaging (MODI) if it is installed (it’s the primary application associated with MDI).

Step-by-step instructions

  1. Try opening the .MDI file with Microsoft Office Document Imaging (MODI) if it is installed (it’s the primary application associated with MDI).
  2. If Windows asks what to use, choose MODI in “Open with”; if you don’t have it, your best option is to open the file on a PC that has MODI available or convert it to a more common format (such as TIFF/PDF) using a compatible conversion workflow.

Common issues

Windows can’t find an app to open the .MDI file

This typically happens because Microsoft Office Document Imaging (MODI) isn’t installed, and MDI is not widely supported by default applications.

  1. Check whether Microsoft Office Document Imaging (MODI) is available on the machine; it’s the most common program associated with .MDI.
  2. If you can’t install or access MODI, use a Windows system where MODI is available to open the file and convert/export it to TIFF or PDF for broader compatibility.

The file opens but pages are missing or look corrupted

Because MDI is often used for multi-page scanned documents, incomplete transfers/downloads can show as missing pages or corrupted rendering.

  1. Re-copy or re-download the .MDI file to ensure it transferred completely (especially if it came via email or network share).
  2. Try opening it in Microsoft Office Document Imaging (MODI) and, if it loads, convert/export to TIFF/PDF to reduce future compatibility problems.

macOS/Linux/phone won’t preview the .MDI file

.MDI is tied to Microsoft Document Imaging and isn’t commonly supported on non-Windows platforms.

  1. Transfer the file to Windows and open it with MODI to confirm it’s valid.
  2. Convert it to TIFF or PDF for viewing on macOS, Linux, iOS, and Android.

Security note

.MDI is an image/document format (TIFF-based) rather than an executable, but it still relies on complex file parsing; only open unknown .MDI files in trusted, well-known software.

Back to .MDI extension page