• Vim - General - How to override $HOME on Windows NT/XP?
  Even if you can change almost nothing, you could could start Gvim/Vim with:     Vim --cmd "let $HOME = 'where-ever-you-like'" .... The --cmd precedes EX and VIMRC files.
  in tech > OS with cmd files gvim home vim vimrc where-ever-you-like

where-ever-you-like from all users