First. let me point out a couple of serious drawbacks in the way you're creating documents. If none of these matter to you, I'll suggest a workaround at the end of this post.
- When you save in .doc format, you don't have access to any of the features added to Word after the 2003 version.
- The .doc format uses somewhere between 50% and 200% more disk space than the .docx format for the same content (.docx is really a .zip file with a different extension, so it's compressed).
If you're sharing documents with others who have only Word 2003, they can install the Office Compatibility Pack to be able to open and edit .docx files.
If you still need to save as .doc files, a better solution would be to go to Word's File > Options > Save dialog and set the "Save files in this format" dropdown to "Word 97-2003 Document (*.doc)". Then always use the File > New command (or Ctrl+N) to create
new documents; the first time you save that document, you'll save it directly as a .doc file.
The difficulty with right clicking in a folder and then New > Word Document is that it bypasses the Normal.dotm template that's the basis for documents created inside the Word program. There is no way, from that right-click menu, to tell Office to create
a .doc file. The workaround I can suggest is to create and save a blank .doc file in a folder that you never otherwise save to; then create a batch file or a VBScript (.vbs) file that makes a copy of that blank document in whatever folder you've clicked in.
This page shows how to create a command on the right-click menu to run a script.