I have verified the code with long header text. There is no issue.

The Text file is aligned properly.

Do you want to break the long header text to multiple line?

Yes, I want to break the long header text to multiple line

This is a text file. It is not possible to break in multiple lines.

Ok. Please how can I export datagridview data to word and save without the grid while retaining format in windows form using vb.net?

Refer

Export DataGridView to Word in Windows Application using C# and VB.Net