Don't use chcp.

User should fix their terminal font to display unicode characters.
Terminal programs can only use Wide String APIs.
For Vim, this requires +multi_byte feature and `set encoding=utf-8`
in the user's vimrc.
Neovim always defaults to `set encoding=utf-8`.

https://dev.to/mattn/please-stop-hack-chcp-65001-27db

Author: janlazo

plug.vim

@@ -139,6 +139,11 @@ function! s:define_commands()
   if !executable('git')
     return s:err('`git` executable not found. Most commands will not be available. To suppress this message, prepend `silent!` to `call plug#begin(...)`.')
   endif
+  if !has('nvim')
+    \ && (has('win32') || has('win32unix'))
+    \ && (!has('multi-byte') || &encoding !=# 'utf-8')
+    return s:err('Only Vim with +multi_byte feature is supported. Add `set encoding=utf-8` in your vimrc before running `plug#begin()`.')
+  endif
   command! -nargs=* -bar -bang -complete=customlist,s:names PlugInstall call s:install(<bang>0, [<f-args>])
   command! -nargs=* -bar -bang -complete=customlist,s:names PlugUpdate  call s:update(<bang>0, [<f-args>])
   command! -nargs=0 -bar -bang PlugClean call s:clean(<bang>0)
@@ -353,24 +358,19 @@ if s:is_win
 
   " Copied from fzf
   function! s:wrap_cmds(cmds)
-    let use_chcp = executable('sed')
     return map([
       \ '@echo off',
       \ 'setlocal enabledelayedexpansion']
-    \ + (use_chcp ? [
-      \ 'for /f "usebackq" %%a in (`chcp ^| sed "s/[^0-9]//gp"`) do set origchcp=%%a',
-      \ 'chcp 65001 > nul'] : [])
     \ + (type(a:cmds) == type([]) ? a:cmds : [a:cmds])
-    \ + (use_chcp ? ['chcp !origchcp! > nul'] : [])
     \ + ['endlocal'],
     \ 'v:val."\r"')
   endfunction
 
   function! s:batchfile(cmd)
     let batchfile = tempname().'.bat'
     call writefile(s:wrap_cmds(a:cmd), batchfile)
-    let cmd = plug#shellescape(batchfile, {'shell': &shell, 'script': 1})
-    if &shell =~# 'powershell\.exe$'
+    let cmd = plug#shellescape(batchfile, {'shell': &shell, 'script': 0})
+    if &shell =~# 'powershell\.exe'
       let cmd = '& ' . cmd
     endif
     return [batchfile, cmd]
@@ -2005,9 +2005,9 @@ function! plug#shellescape(arg, ...)
   let opts = a:0 > 0 && type(a:1) == s:TYPE.dict ? a:1 : {}
   let shell = get(opts, 'shell', s:is_win ? 'cmd.exe' : 'sh')
   let script = get(opts, 'script', 1)
-  if shell =~# 'cmd\.exe$'
+  if shell =~# 'cmd\.exe'
     return s:shellesc_cmd(a:arg, script)
-  elseif shell =~# 'powershell\.exe$' || shell =~# 'pwsh$'
+  elseif shell =~# 'powershell\.exe' || shell =~# 'pwsh$'
     return s:shellesc_ps1(a:arg)
   endif
   return shellescape(a:arg)