:set encoding=utf-8to _vimrc helps with input. Now I can press
ctrl-k a -to get lower-case 'a' with a macron. The next trick is to add
:set guifont=DejaVu_Sans_Mono:h10:cANSIso another font is used. This actually displays the lower-case 'a' with a macron instead of a black rectangle. To see what fonts are available and to help in constructing the guifont arguments, type into vim
:set guifont=*A font selection dialog will pop up. Choose a combination that works for you, then type
:set guifontto see what needs to be put into _vimrc. By the way, I put _vimrc in C:\Documents and Settings\Administrator, which I figured out by typing
:echo $HOMEinto vim.