Problem mapping Ctrl+Alt combinations in GVIM on windows

Hello,

I am trying to map some basic Ctrl+Alt key combinations for GVIM on windows,
for example >
    :imap <C-M-L> <C-Right>

but I've become seriously stuck.  It seems that windows GVIM does not respond
at all to <C-M-x>, where x is virtually any printable character (0-9,a-z,
punctuation, etc.).

To test, I hit ctrl-Q while in insert mode, and then ctrl-alt-x key
combinations, (as described above) and nothing happens at all.  However, it
does respond to other non-printable keys, for example <M-C-Left>, but that's
about it.

Can anyone else confirm this to be the case?  And if so, are there any
work-arounds?  Key combinations like that would be extremely useful for me...
By the way, I'm using version 7.3.46, installed just a few days ago.

Many thanks in advance for your help.

-WES

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