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What is a .dm3 file?
A .dm3 file is a Gatan Digital Micrograph File Format (DM3) (version 3). This one is a specialist format without an obvious everyday home.
How to open a .dm3 file
- The program that created it is by far the most reliable way to open it.
- On Windows, use a hex viewer or the free TrID tool to identify what the file really is.
- On Mac or Linux, running `file yourfile` in the terminal identifies most formats instantly.
The registry records this extension against Gatan Digital Micrograph File Format (DM3), so software from that family is the most likely match.
How to convert a .dm3 file
- Identify the file first, then look for an export or Save As option in whatever program can read it.
The technical record
For archivists, developers and the merely curious: these are the PRONOM registry entries for .dm3.
| Format name | Version | MIME type | PUID |
|---|---|---|---|
| Gatan Digital Micrograph File Format (DM3) | 3 | — | fmt/1131 |