Hi Jim,
After research, I find OpenOffice 3.3 is not supported on Windows 7. Did you try to right click on the attachment and save to open?
I suggest installing OpenOffice 3.3 in compatibility mode.
Right click install file -> Troubleshoot compatibility -> Try recommended settings -> Start the program -> next -> save the settings.
Best Regards,
Niki
Please remember to click "Mark as Answer" on the post that helps you, and to click "Unmark as Answer" if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.