using R under windows

Suppose I have a is a plain text file code.r full of R code that I want to
source into R. My problem is that Windows invisibly tacks ".txt" onto the
end of the filename (the name looks like code.r but it is really
code.r.txt). How to get windows to both allow me to call it code.r (for
real! Not code.r.txt) and to edit it as a text file by default (say with
Notepad)?

I believe under the 'save as' menu, if you select file type to be 'all
files', Windows will not try to outsmart the user w/ the selection of file
extensions.

-J

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