ALT+ SHIFT mapping doesn't work

Hi,

I have the following mappings:

inoremap <M-S-7> _
inoremap <M-7> -

When I do <M-7> I get - (the dash char), what is what I expected
When I do <M-S-7> I get | (the pipe char)
I would except _ (the underscore char)

When I type :verbose map! <M-S-7>
Vim replies withL: I <S-.> *_-7>
Last set in c:… myfile

Why do I still get the | (pipe char)?

I'm using gvim on windows 7

Rgds,
Jeri

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