File Extension TOS

.TOS File

File extension: TOS
File type: Executable


Notes about the TOS file extension:



To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened" (Windows 7) or "How do you want to open this file?" (Windows 10) if you double-click the file. There click on "More apps" and choose a suitable software to view such files on your PC or from email attachments.

The TOS file type is primarily associated with 'Atari' by Atari. TOS = The Operating System - Sometimes an archive. Also, sometimes a disk image.

Detailed information for file extension TOS:


Primary association: Atari
Company: Atari
Mime type: application/octet-stream
Identifying characters Hex: 60 1A , ASCII: `
Related links: Wikipedia Atari TOS Page

Other applications associated with file type TOS:

  • The Only Sheet PLUS [TOS+] (Data File) by Richard Taillon, The Only Sheet+ is a Microsoft Excel workbook which has been designed to automate many aspects of character maintenance for players of the Dungeons & Dragons version 3.5 game published by Wizards of the Coast. , , The Only Sheet is entirely based on the System Reference Document, which is part of the Open Game License. , , This is a text file, similar to a .ini file, which contains information about a Character. , , [A prior version (TOS) used the extension MCS which the new version cannot open.]
    , This association is classified as Text.
  • Unknown Apple II File ((found on Golden Orchard Apple II CD Rom))
File Identifier - TrID
'Identifying characters' used on FILExt.com are
provided by Marco Pontello from his TrID database




To change file associations press Windows Key + X and then Apps and Features > Default apps > Choose default apps by file type. Invalid file associations could be the result of underlying issues within your Windows PC.

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