_vimrc not run when invoking gvim on text file from context menu

In Windows 7, I got a program "pinned" to the taskbar. It is
basically a shortcut with the "Target" field set to:

"C:\Program Files (x86)\Vim\vim73\gvim.exe" -u _vimrc

and the "Start in" field set to $USERPROFILE. The _vimrc is also in
$USERPROFILE, so it runs when gvim is started.

However, when I right click on a text file in Windows Explorer and
choose "Edit with vim", _vimrc is not run. Is something I can do to
have it run?

There are restrictions that a solution would have to observe. First
is that I don't have admin privileges, so I can only stick _vimrc in
places where $USERNAME can write. Also, $HOME is not a good place for
it because it is set to a network drive. Finally, since I'm invoking
gvim from the context menu, I'm not aware of a way to set environment
variables for such an invocation of vim (unlike the case invoking vim
from a script or command line).

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