Inserting Columns into many excel files

Hello all,
First I wanted to introduce myself. My name is Paul and I am new to Excel programming but have been working in excel for many years using different techniques. I look forward to learning from you all and hopefully I can contribute as well.

I have approximately 400 excel files that were created using the same "Form". The "form" is just an excel file that has been setup for manual data entry. The company I work for is controlling all of our documentation and making sure that everyone is using the correct (controlled) forms. I need to update the "Form" and all of the 400 files so that they all have some additional columns. Specifically, I would like to insert 3 columns in each of the files (at the same location for all files), one to add room for a Document Revision and the other two for additional comments.

Can someone here please explain to me how I would create the programming to accomplish this? Any help/direction you can give is appreciated. Also I apologize in advance if I ask a stupid question to any of your responses.

Thanks,
Paul

Maybe this.