Beginning with Office 2007, Microsoft unveiled a new file format, called Open XML, which uses the .docx extensionbut isn't compatible with older versions of Office without some assistance. Here ...

While admittedly it’s not as simple as it is on macOS to open a .docx file using Pages, here's how to open, edit and even re-export .pages files on a Windows PC.

Although converted files retain most of the features of the original DOCX version, some newer content options appear in altered form, reflecting the older Word versions' lack of support for them.