There's no magic involved ;-)
I'm just mildly surprised that anyone would choose to use any software other than Adobe's own to open PDF files.
PDF started, of course, as a proprietary format owned by Adobe, and I've used it since those early days when Adobe's own software was the only stuff that would work.
Over the years, it has become much more "open", and other software has been able to use and interpret at least parts of it.
In fact, I think it is theoretically now almost completely open, but Adobe still maintain parts of the delivery that others choose not to implement or interpret. Hence Acrobat Reader is probably the go-to software for processing existing PDFs to ensure full functionality.
I've certainly used other software (such as Word) to create my own PDF documents, but always use Acrobat Reader for opening existing ones (it's one of the first downloads when configuring a new machine)
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