From WPKG | Open Source Software Deployment and Distribution
Jump to: navigation, search also has versions of OpenOffice (though they're a different OpenOffice, with different capabilities, provided by Novell rather than Sun Microsystems). They have the main installer (which includes en-us) and language packs. No JRE is included (and has a tickbox for JRE for the official version) and it doesn't have a startup registration wizard.

File associations - there are likely looking properties in the MSI - REGISTER_ALL_MSO_TYPES and REGISTER_xxx where xxx is the various file extensions (doc, docx etc.)