While the bit about file interoperability may be more windows-specific, there is such a thing as the “PC Ecosystem”. The software has alternatives: dominated by DOS, then Windows, but also available are Linux and the various minor UNIX-likes, but the hardware really is a specific ecosystem based on a specific set of standards.
The way you use “PC” as a synonym for “Windows” proves that you are indeed a long term Mac user.
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At least you didn’t call them IBMs
Of course, they are IBM compatibles!
While the bit about file interoperability may be more windows-specific, there is such a thing as the “PC Ecosystem”. The software has alternatives: dominated by DOS, then Windows, but also available are Linux and the various minor UNIX-likes, but the hardware really is a specific ecosystem based on a specific set of standards.
Shhh! Don’t upset them, they don’t know!