What library does OpenOffice use to read/write Microsoft Word?

Abiword use wvWare to access Microsoft Word.

Do you know what does OpenOffice use?

Thank you.

 

Here is a rundown of everything used:


wiki.services.openoffice.org/wiki/Architecture/Libraries

 

Thank you.
It seems OpenOffice use its own MS Office filters, And the its MS Office filters are very linked to Open Office's specific code. Don't want to spend time on separate the MS filters from OpenOffice, may switch to wvWare.