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if (!(Test-Path alias:gfe)) { Set-Alias gfe Get-FileEncoding }



function Get-FileEncoding {

  <#

    .NOTES

        Author: greg zakharov

  #>

  param(

    [Parameter(Mandatory=$true, ValueFromPipeline=$true)]

    [ValidateScript({Test-Path $_})]

    [String]$FileName

  )

 

  begin {

    [Text.Encoding] | Get-Member -Static -MemberType Property | % {$enc = @{}}{

      if (($bytes = [Text.Encoding]::($_.Name).GetPreamble()) -ne $null) {

        $enc[$_.Name] = $bytes

      }

    }

  }

  process {

    try {

      $fs = [IO.File]::OpenRead($FileName)

      $buf = New-Object "Byte[]" $fs.Length

      [void]$fs.Read($buf, 0, $buf.Length)

     

      if (($enc = $enc.Keys | ? {

        foreach ($arr in ($buf[0..1], $buf[0..2], $buf[0..3])) {

          (Compare-Object $enc[$_] $arr -SyncWindow 0) -eq $null

        }

      }).Length -eq 2) { $enc = 'UTF32' }

      if ($enc -eq $null) { $enc = 'UTF7' }

    }

    catch {}

    finally {

      if ($fs -ne $null) { $fs.Close() }

    }

  }

  end { [Text.Encoding]::$enc }

}

 http://poshcode.org/5292