Using Word object library in distributable app

We have a paid subscription to MSDN...

Does anyone know if you can included Word/Office libraries, in particular a grammer/speller checker in redistributable apps?

Also, does anyone know of a good 3rd-party speller/grammar checker for .Net apps?

The reason I ask is we are looking for functionality to open at the least Word/Excel files within our app. The spelling/grammar checker is a whole seperate thing.

In a manner similiar to how Sun's StarOffice is able to open Word/Excel documents, we need to find a way to open MS documents.