When open gvim, there is a small icon
Vim in the title plus buffer name.
I'd like to be able to hack anything about vim, including being able to change this gvim's icon. Is there a way to do that?
I solved my problem by reading the doc at
*windows-icon* Q. I don't like the Vim icon, can I change it? A. Yes, place your favorite icon in bitmaps/vim.ico in a directory of 'runtimepath'. For example ~/vimfiles/bitmaps/vim.ico.