[tssva]

Even the creator of the defacto standard document format doesn't ship the ability to read it out of the box. Neither does the other major desktop operating system vendor.

[glowingly]

Wordpad has read docx files for a while now.

edit: I just checked my Win11 VM, and Wordpad is included by default. It also reads and writes docx and odt.

[tssva]

WordPad only supports limited capabilities of the docx format.