TOS File Type

- The quick facts

What are TOS files and how to open them

Are you having problems opening a TOS file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a TOS file?

A .TOS file is an Atari ST TOS Executable file.

We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

How to open TOS files

Important: Different programs may use files with the TOS file extension for different purposes, so unless you are sure which format your TOS file is, you may need to try a few different programs.

While we have not verified the app ourselves yet, our users have suggested a single TOS opener which you will find listed below.

Last updated: September 7, 2017

Various apps that use files with this extension

These apps are known to open certain types of TOS files. Remember, different programs may use TOS files for different purposes, so you may need to try out a few of them to be able to open your specific file.


Help us help others helps thousands of users every day, and we would love to hear from you if you have additional information about TOS file formats, example files, or compatible programs. Please use the links below or email us at to discuss further.