Format of hst files

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Following problem;

i have downloaded M1 history which contains millions of bars (from alpari history center). They only offer M1 and D1 data as history. On Mt4 i press F2 and it only show 65535 and can only expoert 65535 M1 bars. This is not enough. 65535 bars at M1 only contains 3 months back data which is too less for my purphose. Also on graphic it only can visualise 65535 bars.

Since i cannot export neither with F2 nor with MQ4 i decided to understand the .hst file format which contains all data. can someone help me to find internal info about this format please?
 
For everyone who is interested to know about HST format here example which reads it. I ll later post an update which will write this info to a CSV file

//+------------------------------------------------------------------+
//|                                               History viewer.mq4 |
//|                      Copyright © 2007, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2007, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net"

//+------------------------------------------------------------------+
//| script program start function                                    |
//+------------------------------------------------------------------+

int start()
  {
//----
   
double varray[10];
int temp[13];
   
  int handle=FileOpenHistory("USDJPY1.HST",FILE_BIN|FILE_READ);
  if(handle<1)
    {
     Print("Cannot create file USDX240.HST");
     return(false);
    }
    
  Print ("File opened successfully");     
  
  int HistoryHandle = handle;
  int ver = FileReadInteger    ( HistoryHandle, 400); Print ("Version = "+ver);
  string s1,s2;
  int i = 0;
  s1=FileReadString    ( HistoryHandle,  64 );
  s2=FileReadString   ( HistoryHandle,  12 ); Print ("Symbol: "+s2);   
  int period = FileReadInteger    ( HistoryHandle, LONG_VALUE ); Print ("Period="+period);
  int digits  = FileReadInteger    ( HistoryHandle, LONG_VALUE ); Print ("Digits="+digits);
  FileReadInteger    ( HistoryHandle, LONG_VALUE );       //timesign  
  FileReadInteger    ( HistoryHandle, LONG_VALUE );       //last_sync
  i= FileReadArray        ( HistoryHandle, temp, 0, 13 ); Print ("Array returned="+i);  
  // for (int k=0;k<i;k++) { Print ("Array["+k+"]="+temp[k]); }
  
  int exit = 0;
  int cnt = 0;
  while (exit == 0)
   {
   // read line
     int _time = FileReadInteger    ( HistoryHandle, LONG_VALUE    );
     if (_time == 0 ) { exit =1; }
     double _open = FileReadDouble    ( HistoryHandle, DOUBLE_VALUE);
     double _high = FileReadDouble    ( HistoryHandle, DOUBLE_VALUE);
     double _low = FileReadDouble    ( HistoryHandle, DOUBLE_VALUE);
     double _close = FileReadDouble    ( HistoryHandle, DOUBLE_VALUE);
     int _volume = FileReadDouble    ( HistoryHandle, DOUBLE_VALUE);
     
      string timestring = TimeYear(_time)+""+TimeMonth(_time)+""+TimeDay(_time)+""+TimeHour(_time)+""+TimeMinute(_time);
      
      if (_time > 0 ) { string line = timestring+";"+_open+";"+_high+";"+_low+";"+_close+";"+_volume; }
     
     if (cnt<5) { Print ("["+cnt+"]"+line);  }
      
    cnt++;  
   
   }
   
   
  Print ("total = "+cnt+" Bars read");
  Print ("Last line="+line); 
  
  FileClose(handle);
   
//----
   return(0);
  }
//+------------------------------------------------------------------+



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