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 with extension    powershell delete all files and folders in a directory    powershell delete all files in directory    powershell delete all files older than x days    powershell delete all files    powershell delete all files in folder recursively