• Reference & Education, Legal
• ST file technical details
• July 21, 2026

An ST file is a file that uses the `.st` file extension, but it does not refer to only one specific format. Depending on where the file came from, an ST file may be a Smalltalk source code file, a Structured Text programming file, an Atari ST disk image, or a custom data file created by a specific application. Because …