Document
What is a .cmx file?
A .cmx file is a Corel Presentation Exchange File (version 5.0). This is a document format, so it holds text and layout meant to be read. Confusingly, this extension has been used by 2 different formats over the years — they're all listed below.
This extension has been used by more than one format
2 different formats have claimed .cmx over the years, so two files with the same extension aren't necessarily the same kind of thing.
How to open a .cmx 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 Corel Presentation Exchange File, Corel Presentation Exchange File, so software from that family is the most likely match.
How to convert a .cmx 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 .cmx.
| Format name | Version | MIME type | PUID |
|---|---|---|---|
| Corel Presentation Exchange File | 5.0 | — | x-fmt/34 |
| Corel Presentation Exchange File | 6 and Later | — | x-fmt/35 |