An st9 file extension is related to the SBIG astronomical image format.
There is one other file type using
the ST9 file extension!
.st9 - SPICE Status file
ST9 file extension - SBIG astronomical image
What is st9 file? How to open st9 files?
File type specification:
The st9 file extension is associated with the SBIG (Santa Barbara Instrument Group) applications.
Santa Barbara Instrument Group develops astronomical instruments and software.
The st9 file stores astronomical image from SBIG.
This st9 file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.