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(Get-Item D:\Downloads) -is [System.IO.DirectoryInfo] # True
(Get-Item D:\Downloads\test.txt) -is [System.IO.DirectoryInfo] # False

if ((Get-Item D:\Downloads) -is [System.IO.DirectoryInfo])
{
  "此路徑是資料夾。"
}
else
{
  "此路徑不是資料夾。"
}