Convert the Doc file to the rtf Format

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First, add a reference to the Microsoft Word 9.0 object library in the project reference.
Code:

Using System;

Namespace DocConvert

{
Class DoctoRtf
{
Static void Main ()
{

// Create a word instance
Word. Application newApp = new Word. Application ();

// Specify the source and target files
Object Source = "c: \ abc \ Source.doc ";
Object Target = "c: \ abc \ Target. rtf ";

Object Unknown = Type. Missing;

// Open the Word file to be converted
NewApp. Documents. Open (ref Source, ref Unknown,
Ref Unknown,
Ref Unknown,
Ref Unknown,
Ref Unknown );

// Specify the Document Type
Object format = Word. WdSaveFormat. wdFormatRTF;

// Change the Document Type
NewApp. ActiveDocument. SaveAs (ref Target, ref format,
Ref Unknown,
Ref Unknown,
Ref Unknown, ref Unknown, ref Unknown );

// Close the word instance
NewApp. Quit (ref Unknown, ref Unknown, ref Unknown );

}
}
}