-u .vimrc acts differently from implicit read of .vimrc

I have the following .vimrc file:

:set backupcopy=yes
:map RR :w<NL>:!ci -l %<NL>
:map RD :w<NL>:!Rcsdiff %<NL>
:map <C-P> :!Lpr3 -m -F bold -f -W100 %<NL>
:set tags=$LD/ptags2
:syntax enable<NL>

The strange thing is, if I let the file read implicitly because it is in
~/.vimrc, it all seems to work.

But, if I invoke vim -u .vimrc

It does not work. Instead, <ctrl/P> causes

:!Lpr3 -m -F bold -f -W100 %<NL>

to appear at the bottom of my screen. To get what I really want I'd have to
replace the <NL> with <C-V><Enter>
(by <Enter> I mean the Enter key).

It all worked on an older system running vim 6.1.320. My current system is
7.3.315

If it seems like there's an obvious workaround, I am only using this example
for simplicity.

Thanks, Hal

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