Avevo un po' di tempo libero e ti ho fatto un scriptino in vbscript, mi sembra che funzioni, inseriscilo dentro un file con estensione htm messo nella stessa cartella del file che contiene i dati, sostituisci i nomi dei file con quelli che ti occorrono ed eseguilo con Internet Explorer (no Firefox o altri).

codice:
<html>
<head>
</head>
<body>

<script language="vbscript">

   option explicit

   dim actualpath, nome_file_inp, nome_file_out, fso, fdi, fdo, riga, output

   actualpath        = replace(left(replace(document.url, "file://", ""), instrrev(replace(document.url, "file://", ""), "\")), "%20", " ")

   nome_file_inp     = actualpath & "dati.txt"
   nome_file_out     = actualpath & "dati2.txt"

   set fso = createobject("scripting.filesystemobject")
   set fdi = fso.opentextfile(nome_file_inp, 1, false)
   set fdo = fso.createtextfile(nome_file_out,true)

   do while fdi.atendofstream <> true
       riga = fdi.readline
       if mid(riga,27,1) = 1 then
          output = "e=e+" & cstr(int(mid(riga,35,2)))
          fdo.writeline output
          output = "e=e+" & cstr(int(mid(riga,38,2)))
          fdo.writeline output
       end if
       if mid(riga,27,1) = 2 then
          output = "d=d+" & cstr(int(mid(riga,35,2)))
          fdo.writeline output
          output = "d=d+" & cstr(int(mid(riga,38,2)))
          fdo.writeline output
       end if
       if mid(riga,27,1) = 3 then
          output = "c=c+" & cstr(int(mid(riga,35,2)))
          fdo.writeline output
          output = "c=c+" & cstr(int(mid(riga,38,2)))
          fdo.writeline output
       end if
       if mid(riga,27,1) = 4 then
          output = "b=b+" & cstr(int(mid(riga,35,2)))
          fdo.writeline output
          output = "b=b+" & cstr(int(mid(riga,38,2)))
          fdo.writeline output
       end if
       if mid(riga,27,1) = 5 then
          output = "a=a+" & cstr(int(mid(riga,35,2)))
          fdo.writeline output
          output = "a=a+" & cstr(int(mid(riga,38,2)))
          fdo.writeline output
       end if
   loop
   fdi.close
   fdo.close
   msgbox "fatto"

</script>
</body>
</html>