Document
What is a .ext file?
A .ext file is an Open Access III Document (version III). This is a document format, so it holds text and layout meant to be read.
How to open a .ext 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 Open Access III Document, so software from that family is the most likely match.
How to convert a .ext file
- Once it opens in LibreOffice or Word, Save As .docx or .pdf to get it into a format you can use anywhere.
The technical record
For archivists, developers and the merely curious: these are the PRONOM registry entries for .ext.
| Format name | Version | MIME type | PUID |
|---|---|---|---|
| Open Access III Document | III | — | fmt/1889 |