Sometimes you face the problem that your files have the wrong encoding. If your machine got PowerShell, which is quite often the case, this is really easy.

For example: You want to change the encoding of every .java file in the current directory and all subdirectories from utf-8 to iso-8859-1:

Get-ChildItem . -include *.java -recurse | ForEach-Object {
  $inputEncoding = [System.Text.Encoding]::GetEncoding("utf-8")
  $outputEncoding = [System.Text.Encoding]::GetEncoding("iso-8859-1")
  $content = [System.IO.File]::ReadAllText($_.Fullname, $inputEncoding)
  [System.IO.File]::WriteAllText($_.Fullname, $content, $outputEncoding)
}

In variable $inputEncoding we set the encoding of all source files. With $outputEncoding you can set the encoding which you want to convert into. You can see valid encoding names in table: http://msdn.microsoft.com/en-us/library/86hf4sb8.aspx.

The Get-ChildItem is somewhat like the find command on Unix. With Get-Help Get-ChildItem you can see further information how you can find files to achieve a more specific search.