Add-Type @"
using System;
using System.Text;
using System.Runtime.InteropServices;
public class WinEnum {
  public delegate bool EnumProc(IntPtr hWnd, IntPtr lParam);
  [DllImport("user32.dll")] public static extern bool EnumWindows(EnumProc cb, IntPtr lParam);
  [DllImport("user32.dll")] public static extern int GetWindowTextLength(IntPtr hWnd);
  [DllImport("user32.dll", CharSet=CharSet.Unicode)] public static extern int GetWindowText(IntPtr hWnd, StringBuilder s, int n);
  [DllImport("user32.dll")] public static extern bool IsWindowVisible(IntPtr hWnd);
  [DllImport("user32.dll")] public static extern bool GetWindowRect(IntPtr hWnd, out RECT r);
  [StructLayout(LayoutKind.Sequential)] public struct RECT { public int L, T, R, B; }
}
"@

$found = New-Object System.Collections.ArrayList
$cb = [WinEnum+EnumProc]{
  param($h, $l)
  $len = [WinEnum]::GetWindowTextLength($h)
  if ($len -gt 0 -and [WinEnum]::IsWindowVisible($h)) {
    $sb = New-Object System.Text.StringBuilder ($len + 2)
    [void][WinEnum]::GetWindowText($h, $sb, $sb.Capacity)
    $t = $sb.ToString()
    $r = New-Object WinEnum+RECT
    [void][WinEnum]::GetWindowRect($h, [ref]$r)
    [void]$found.Add([pscustomobject]@{
      Title = $t
      W = $r.R - $r.L
      H = $r.B - $r.T
      X = $r.L
      Y = $r.T
    })
  }
  return $true
}
[void][WinEnum]::EnumWindows($cb, [IntPtr]::Zero)

Write-Output "=== 可见顶层窗口中标题含 BiliDownloader 的 ==="
$found | Where-Object { $_.Title -like "*BiliDownloader*" } |
  Select-Object Title, W, H, X, Y | Format-Table -AutoSize | Out-String

Write-Output "=== 前 12 个可见窗口（对照）==="
$found | Sort-Object -Property W -Descending | Select-Object -First 12 Title, W, H |
  Format-Table -AutoSize | Out-String