Remove BOM in Javascript

Sometimes you need to remove the BOM from a UTF-8 File. E.g. because Java can't deal with it. So if you use Windows as your OS you can use the follwing JavaScript.
Simple execute it in a console.

 // Removes the Byte Order Mark - BOM from a text file with UTF-8 encoding  
 // The BOM defines that the file was stored with an UTF-8 encoding.  
 function RemoveBOM(filePath) {  
     // Create a reader and a writer  
         var writer,reader, fileSize;  
         var writer = new ActiveXObject("Adodb.Stream");  
         var reader = new ActiveXObject("Adodb.Stream");  
     // Load from the text file we just wrote  
         reader.Open();  
         reader.LoadFromFile( filePath);  
     // Copy all data from reader to writer, except the BOM  
         writer.Mode=3;  
         writer.Type=1;  
         writer.Open();  
         reader.position=5;  
         reader.copyto(writer,-1);  
     // Overwrite file  
         writer.SaveToFile(filePath,2);  
     // Return file name  
         RemoveBOM = filePath;  
     // Kill objects  
         var writer = null;  
         var reader = null;  
 }  
 RemoveBOM("OPM_Mitarbeiter.csv-utf8.txt");  

cscript bomremover.js