How to parse ms-office docs

I need to create a application (preferably in c#/win32) to open a office doc [97-2003 format] ( Word, PPT, EXCEL) and parse the data structures, validate the fields, values and cross references, show the errors found in the document and 开发者_StackOverflow社区possible solutions to fix the errors in document as per specification.

Are there any tools available / open source library or documentations.

Can "Office Interop" help for parsing the details.

Here's the official documentation.

People recommend NPOI for such tasks

It's an open source library for .NET which do not require Office to be installed.