.net Powershell 2.0断开的Base64文件转换

我在电脑上找到了这个密码

它适用于windows 8.1 Powershell 4，但在Powershell 2上，当我将base64字符串解码回文件时，它似乎在文件末尾添加了一个字节。Powershell 2也会抛出关于base64字符串长度无效的错误，但它仍然会创建文件

我已经花了几个小时试图解决这个问题，但我对.net的了解还不足以解决这个问题

我用这些函数来携带的数据是一个较大的脚本。它在Powershell 4上运行时没有任何错误

我需要它在3000多台windows 7机器上运行，坚持使用Powershell 4不是一个解决方案

function ConvertTo-Base64
{
    param
    (
        [string] $SourceFilePath,
        [string] $TargetFilePath
    )

    $SourceFilePath = Resolve-PathSafe $SourceFilePath
    $TargetFilePath = Resolve-PathSafe $TargetFilePath

    $bufferSize = 9000 # should be a multiplier of 3
    $buffer = New-Object byte[] $bufferSize

    $reader = [System.IO.File]::OpenRead($SourceFilePath)
    $writer = [System.IO.File]::CreateText($TargetFilePath)

    $bytesRead = 0
    do
    {
        $bytesRead = $reader.Read($buffer, 0, $bufferSize);
        $writer.Write([Convert]::ToBase64String($buffer, 0, $bytesRead));
    } while ($bytesRead -eq $bufferSize);

    $reader.Dispose()
    $writer.Dispose()
}

function ConvertFrom-Base64
{
    param
    (
        [string] $SourceFilePath,
        [string] $TargetFilePath
    )

    $SourceFilePath = Resolve-PathSafe $SourceFilePath
    $TargetFilePath = Resolve-PathSafe $TargetFilePath

    $bufferSize = 9000 # should be a multiplier of 4
    $buffer = New-Object char[] $bufferSize

    $reader = [System.IO.File]::OpenText($SourceFilePath)
    $writer = [System.IO.File]::OpenWrite($TargetFilePath)

    $bytesRead = 0
    do
    {
        $bytesRead = $reader.Read($buffer, 0, $bufferSize);
        $bytes = [Convert]::FromBase64CharArray($buffer, 0, $bytesRead);
        $writer.Write($bytes, 0, $bytes.Length);
    } while ($bytesRead -eq $bufferSize);

    $reader.Dispose()
    $writer.Dispose()
}

function Resolve-PathSafe
{
    param
    (
        [string] $Path
    )

    $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($Path)
}

ConvertTo-Base64 .\file .\Converted-File.txt

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它会在输出文件的末尾添加一个字节吗？或者到原始流（导致不同的Base64字符串）？从Base64到文件的转换似乎将最后一个字节加倍。