This link will take you to a special build of OpenOffice.org that has a few features the official version does not. They claim it has OOXML support (I'd say it has Office 2007 docx, xlsx, etc. support). I have tested a few simple docx files (on XP) and everything except graphics have worked. They claim that it is also faster than the official OOo.
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Go-oo has built in OpenXML import filters and it will import your Microsoft Works files. Compared with up-stream OO.o, it has better Microsoft binary file support (with eg. fields support), and it will import WordPerfect graphics beautifully. If you are reliant on Excel VBA macros - then Go-oo offers the best macro fidelity too. If you expect your spreadsheets to calculate compatibly, or you get embedded Visio diagrams in your documents, you'll want Go-oo.
Do note that they recommend dual licensing under the LGPL and CDDL for the majority of their code.
If you go to the download page, the link for the Windows version is a bit dated, going here http://go-oo.mirrorbrain.org/stable/win32/ instead will allow you to get the latest 2.4.1 build.
I have not tested this version on Win98 as I'm not running it at the moment.
The latest version as of this posting is GoOo-en-US-2.4.1-5.exe (I guess you install a language pack if need be). If someone could test and let us know, I'm sure it would be appreciated.
I know some are disappointed with the OOo losing Win98 support. I think this version could fill some gaps for a while. Hopefully, it will work with 98 and there will be a few additional updates.