How to open .CPA files on Android
To open .CPA files on Android, android typically will not have a standard handler for chemical/x-compass; transfer the .CPA file to a desktop OS (especially Linux with shared-mime-info) or ask the sender to export to a more common format supported by your apps.
Step-by-step instructions
- Android typically will not have a standard handler for chemical/x-compass; transfer the .CPA file to a desktop OS (especially Linux with shared-mime-info) or ask the sender to export to a more common format supported by your apps.
Common issues
The file opens in the wrong application (or no app is suggested)
Because .CPA is ambiguous and chemical/x-compass is not universally supported, your OS may not know what to do with it or may pick an unrelated app.
- Identify the producer of the file (original software/workflow) and open it there.
- On Linux, verify what MIME type is being assigned (often chemical/x-compass) and adjust file associations only if you have a known compatible application.
“Unsupported file format” or “file is corrupted” error
This often happens when the .CPA file is not actually a Compass Takahashi chemical file, or it was exported from a different product that also uses .CPA.
- Confirm with the sender what program created it and whether it can be re-exported to another, better-supported chemistry format.
- Try opening the file on a Linux system where shared-mime-info may classify it as chemical/x-compass to help narrow down the type.
MIME type confusion (chemical/x-compass not recognized)
chemical/x-compass appears in shared desktop MIME databases and chemistry extension lists, but it is not an IANA-registered media type, so some systems and tools may not recognize it.
- Treat the file as application-specific rather than relying on MIME type auto-detection.
- If you control the workflow, prefer exporting/sharing in a more widely recognized chemistry format for cross-platform use.
Security note
Treat .CPA files as untrusted input unless you know the source application: the extension is ambiguous, and opening unknown files in complex parsers can carry risk from malformed content.