How to open .SMF files on Windows
To open .SMF files on Windows, install Apache OpenOffice (Math) or LibreOffice.
Step-by-step instructions
- Install Apache OpenOffice (Math) or LibreOffice.
- In the suite, open the file (e.g., File → Open) and select the .SMF document; or right-click the file → Open with → choose OpenOffice/LibreOffice and optionally set it as the default.
Common issues
The .SMF file won’t open or shows an “unknown format” error
This often happens when no StarMath-compatible software is installed, or when the file is not actually a StarMath formula despite using the .smf extension.
- Install or update LibreOffice or Apache OpenOffice and try opening the file from inside the suite (File → Open).
- Confirm the file’s origin: if it did not come from StarOffice/OpenOffice/LibreOffice Math-related workflows, it may be a different .SMF variant.
The file opens but the formula is missing or looks corrupted
The file may be incomplete (bad transfer/download) or damaged, which can prevent the math document from parsing correctly.
- Re-copy or re-download the .SMF file from the original source and try again.
- Try opening it in an alternative compatible suite (e.g., LibreOffice if OpenOffice fails, or vice versa).
Double-click opens the wrong app
Your OS may have associated .SMF with another program (especially because the extension is known to be used for multiple file types).
- Use “Open with” to select LibreOffice or Apache OpenOffice, and set it as the default for .SMF.
- If the file still doesn’t open correctly, treat it as an ambiguous extension and verify what created it.
Security note
Because .SMF is an office-document format opened by complex parsers, only open .SMF files you trust—malformed documents can potentially trigger vulnerabilities in document-reading software.