How to open .CSF files on iOS
To open .CSF files on iOS, there is usually no practical native iOS support for CAChe MolStruct .CSF files; transfer the file to a desktop system and convert it with Open Babel.
Step-by-step instructions
- There is usually no practical native iOS support for CAChe MolStruct .CSF files; transfer the file to a desktop system and convert it with Open Babel.
Recommended software
- Textastic
- Kodex
- Files app
Alternative methods
- Open .CSF in a browser-based viewer if desktop apps fail.
- Try opening .CSF on iOS with a secondary app to rule out app-specific issues.
- Convert .CSF only with trusted tools when direct opening is not possible.
Common issues
No app can open the .CSF file
Many systems don’t recognize .CSF as a common end-user format. In chemistry contexts it is typically handled by specialized tooling, often via conversion.
- Confirm the file came from a chemistry/molecular modeling workflow (CAChe MolStruct).
- Use Open Babel to convert it to a more common chemistry format and open the converted result.
Open Babel cannot read the .CSF file
Open Babel documentation and other references list CAChe MolStruct as write-only in some contexts, so your file may not be readable even if the format is known.
- Check whether your goal is to create/export CSF (write) versus import CSF (read).
- If you must read it, try obtaining the original software/workflow that produced the file, or ask for the data in a different export format.
File opens but appears empty or incorrect after conversion
Conversion quality depends on how completely the structure information is represented and whether the converter supports all fields/variants.
- Convert to more than one target chemistry format and compare results to detect information loss.
- If possible, request a different export format from the source system that better preserves the needed properties.
Security note
.CSF in this context is a data file (chemical structure), not an executable format, but opening it still relies on parsers—avoid using obscure or untrusted converters/viewers for files from unknown sources.