Rename the `.pages` file to `.zip`
Open the `.zip` file with File Explorer or a zip utility
Extract the contents
Open the `QuickLook` folder
View the `Preview.pdf` file if present
Upload the `.pages` file to iCloud Drive
Open it in iCloud Pages using a web browser
Export the document as Word or PDF from iCloud Pages
Ask the sender to save and resend it as `.docx` or `.pdf`
Use a file conversion tool that supports `.pages` files