I found the memolist is not supported well on the windows. memolist and memogrep can not work any more.
sorry, I don't have a windows machine to test it.
but my coworker uses memolist.vim on windows.
can you execute :e ~/memo and :vimgrep foo ~/memo ?
:vimgrep foo ~/memo
if :e ~/memo does'nt work, install Shougo/vimfiler.
if :vimgrep foo ~memo does'nt work, intall fuenor/qfixgrep.
:vimgrep foo ~memo
:e ~/memo does not work, but I have installed vimfiler already.