No. Once opened, any file can be saved as .doc or .dot. Just choose File -
Save as, and set the type as desired.
If you open a .dot file from Word (using File - Open), then you're opening
that .dot file for editing, and unless you explicitly choose File - Save As
and save it as a .doc file or something else, then you'll be saving changes
to the .dot file you're editing.
If, however, you choose File - New and choose a .dot file upon which to base
a new document, then the file will be saved as specified in the default save
format (in Tools - Options - Save). You can, of course, explicitly use
File - Save As to save in a format different from the default.
If you open a .dot file by double-clicking it (using Windows Explorer), then
a new Document # window will be opened based on the .dot file. This is
equivalent to choosing File - New and specifying that .dot file as the basis
for creating a new document. Again, the default save format is governed by
the Tools - Options - Save setting. But, as before, you can use File - Save
as to override the default.
..dot files are designed for creating new documents. You can edit .dot files,
but it's harder to do, simply because double-clicking using Windows Explorer
defaults to creating a new document, rather than to editing the .dot file
itself.
It's all-round less confusing if you save document files as .doc, and save
templates as .dot. That way, other users' expectations will be not be upset.
I hope this clarifies...
--
Herb Tyson MS MVP
Author of the Word 2007 Bible
Blog:
http://word2007bible.herbtyson.com
Web:
http://www.herbtyson.com