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.

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Here's the official documentation.

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People recommend NPOI for such tasks

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