Document
What is a .mdi file?
A .mdi file is a Microsoft Document Imaging File Format. This is a document format, so it holds text and layout meant to be read.
How to open a .mdi file
- Try LibreOffice (free, Windows/Mac/Linux) — it opens an enormous range of current and historic document formats.
- Microsoft Word and Google Docs handle most mainstream document types.
- If nothing opens it, open it in a text editor: many older document formats have readable text inside.
The registry records this extension against Microsoft Document Imaging File Format, so software from that family is the most likely match.
How to convert a .mdi file
- Once it opens in LibreOffice or Word, Save As .docx or .pdf to get it into a format you can use anywhere.
MIME type
When a .mdi file travels over the web, servers label it with this MIME type:
image/vnd.ms-modiThe technical record
For archivists, developers and the merely curious: these are the PRONOM registry entries for .mdi.
| Format name | Version | MIME type | PUID |
|---|---|---|---|
| Microsoft Document Imaging File Format | — | image/vnd.ms-modi | fmt/881 |