[llamabeast]

When you do "Save As" in Open Office, click on "File Typ2", and select "Text file" or some such, with the default extension of "txt". Then turn off automatic file extensions, and save it as "whatever.dm". This will make Open Office save it in plain text rather than whatever format it normally uses, so Dominions will be able to read it.

You'd probably have an easier time using notepad to be honest (if notepad still exists in Vista).