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I thought you downloaded the Linux Subsystem from the Windows store?

True, that's a possible reason, but I don't think the X server normally comes from the store. (Is there even an X server in the Windows Store?)

No, it looks like this is a traditional desktop Windows X server.

It's vcXsrv, a regular X11 server for Windows.

I got it from add/remove features, don't know if it changed.