Can't "Insert" HTML tags into .INC files

I'm trying to figure out why Dreamweaver's "Insert" menu shows all of its
functions greyed out when I load an include file (with a .inc extension) for
editting in Code view.

It's pretty standard practice for Web developers to use include files to copy
in common code into Web pages using the #include directive. Why doesn't
Dreamweaver recognize these files as HTML files and allow me to drop in HTML
tags using the Insert menu? Can I fix this?

Regards,

Chris

Why doesn't
Dreamweaver recognize these files as HTML files and allow me to drop in
HTML
tags using the Insert menu?

Because "inc" says nothing about the contents of the file. An include could
be almost anything...asp code, java, javascript, css, etc...

-Darrel