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function ConvertTo-Base64 {
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    param (
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        [Parameter(Mandatory=$true)]
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        [string]$InputFile,
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        [Parameter(Mandatory=$true)]
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        [string]$OutputFile
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    )
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    # $f=[io.file]::ReadAllBytes($InputFile)
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    $f = Get-Content -Path $InputFile -Encoding Byte
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    # $f = Get-Content -Path $InputFile -AsByteStream # PS 7+
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    $base64 = [Convert]::ToBase64String($f)
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    Set-Content -Path $OutputFile -Value $base64
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    # [io.file]::WriteAllText($OutputFile,$base64)
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}
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function ConvertTo-File {
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    param (
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        [Parameter(Mandatory=$true)]
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        [string]$InputFile,
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        [Parameter(Mandatory=$true)]
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        [string]$OutputFile
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    )
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    # $f=[io.file]::ReadAllText($InputFile) # [Text.Encoding]::UTF8,[Text.Encoding]::GetEncoding("GB2312")
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    $f = Get-Content -Path $InputFile
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    $bytes = [Convert]::FromBase64String($f)
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    Set-Content -Path $OutputFile -Value $bytes -Encoding Byte
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    # Set-Content -Path $OutputFile -Value $bytes -AsByteStream # PS 7+
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    # [io.file]::WriteAllBytes($OutputFile,$bytes)
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}
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# Usage
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# ConvertTo-Base64 -InputFile 'C:\MyFolder\file.exe' -OutputFile 'C:\MyFolder\base64.txt'
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# ConvertTo-File -InputFile 'C:\MyFolder\base64.txt' -OutputFile 'C:\MyFolder\file.exe'