This sample file accompanies the MSDN article "Creating a Custom Spell-Checker with Word 2003 and Visual Basic .NET" which demonstrates using the Word object model in conjunction with Microsoft Visual Basic .NET to create a simple spell-checker whose functionality you can add to your own applications. To view the article, click the link in the Related Links section.
You can tie into the objects and methods of Microsoft Office Word 2003 to create powerful applications. To demonstrate creating and using a spell-checker with object and methods from Word, the article describes how to create an application in Visual Basic .NET that checks a text file for spelling errors.
This download presents a complete example of this sample application.