There are 2 other file types using
the COS file extension!

empty icon.cos - Capture One configuration file

empty icon.cos - Creatures source code

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COS file extension - Scarlett Expert System Compiler query file

What is cos file? How to open cos files?

File type specification:

Various data file type icon Various data file type

The COS file extension is associated with the Scarlett Expert System Compiler. The .cos file stores query data.

Scarlett Expert System Compiler is obsolete product and .cos files are not supported by any current known software.

Help how to open COS files:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert file with extension COS:

As far as we know, this .cos file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

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