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什么系统呢 win7可以试试POWERSHELL

$list = [System.IO.Directory]::GetFiles($PWD, '*.bcwav', 'AllDirectories')
ForEach ($file in  $list) {
    $fs=new-object io.filestream $file,open;
    $fs.seek(9,0);
    $fs.writebyte("0");
    $fs.flush();
    $fs.close();
}
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