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> There is no perfect design pattern

There I can certainly agree, but ...

> An exe is a singleton, a file is a singleton. Most things in a computer are singletons.

I would say you are mistaking the instance for the class. An individual exe/file/... are instances of the abstract concept file or executable.

What you are interacting with is usually an instance, not a class.

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And a singleton is not an instance? Its all the same thing; 1 file, 1 instance. A file has properties, size, data memory, you can copy, paste it, delete it. A file has a type though generic.

> And a singleton is not an instance?

No, a singleton is a pattern that ensures that there is at most a single instance of a class.

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