Step by step:
1. Install WINE, all defaults from OS package manager.
2. Open terminal. Change to directory with Office 97 install files.
3. Run `wine setup`
4. For me: turn off everything except the essential bits of Word. Do not install OS extensions, as they won't work. No bits that plug into other apps. No WordMail, no FastFind, no Quicklaunch toolbar, no Office Assistant.
5. Enter product key: 11111-1111111
6. Allow to complete.
7. Install SRs.
8. Run and use app.