/run with system variable support...

alias run {
  var %r $1-
  :varcheck
  if ($regex(%r,/%([0-9a-zA-Z]+)%/S)) {
    var %r $regsubex(%r,/%([0-9a-zA-Z]+)%/Sg,$sysvar(\t))
    goto varcheck
  }
  else {
    if (*Invalid Path* iswmcs %r) { echo $color(info) * /run: one or more variables were invalid. | halt }
    !run %r
  }
  halt
  :error
  haltdef
  echo $color(info) $gettok($error,1,40)
  reseterror
  halt
}
alias sysvar {
  var %var $1
  unset %error
  .comopen s Wscript.Shell
  noop $com(s,RegRead,1,bstr,$+(HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment\,%var))
  var %x $com(s).result
  noop $com(s,RegRead,1,bstr,$+(HKCU\Volatile Environment\,%var))
  var %y $com(s).result
  noop $com(s,RegRead,1,bstr,$+(HKCU\Software\Liter\SystemInfo\SystemFolders\,%var))
  var %z $com(s).result
  .comclose s
  return $iif(%x,$v1,$iif(%y,$v1,$iif(%z,$v1,Invalid Path)))
}