As promised, Brian Jones has announced the posting of the Microsoft Office Binary Format specs in this blog posting.
Along with these formats we have also provided a few additional format specs:
- Windows Compound Binary File Format Specification PDF | XPS
- Windows Metafile Format (.wmf) Specification PDF | XPS
- Ink Serialized Format (ISF) Specification PDF | XPS
So, if you are building applications on older versions of Office, or would like to manipulate those formats on a web server, you can read-up on them and begin coding!