Vim NERDTree colors
If you want to customize file colors based on extension, I created this plugin. You can use it with vim-devicons, but If you don't have it, you can add this line to your .vimrc and it will highlight the filenames:
let g:NERDTreeFileExtensionHighlightFullName = 1
:hi Directory guifg=#FF0000 ctermfg=red