関連ワード:  powershell delete multiple files    powershell delete multiple files wildcard    powershell delete multiple files if exists    powershell delete all files in folder    powershell delete all files and folders in a directory    powershell delete all files with extension    powershell delete all files in directory    powershell delete all files older than x days    powershell delete all files in folder recursively    powershell delete all files