[Zope] ZAAPlugins works for MS Office but not for OpenOffice

Hi, after wanted to index PDFs and MS Office files, I found various items on the internet which point to the use of ZAAPlugins and PloneExFile. This seems to work well. However, openoffice files (.sxw, .sxi for example) aren't handled or recognised. Is there a solution or plugin for this? Even if there is none, can i override the defualt icon that is displayed for these images? The question mark icon is a little confidence-uninspiring! I did try to use the "find" tool on zope to find a mapping from extension/type to icon but couldn't find one. tariq