🚀 go-pugleaf

This is an example of my code:

//-------------------------------------------------------------
void TCompCodici::SaveFile()                       
{                                                  
  FILE *file = fopen (".\\Cfg\\CompCod.dat", "w"); 
  if (file == NULL)
    {
    ShowMessage("Error! Can't open file CompCod.dat");
    return;
    }                                      
  fprintf (file, "[Costanti compilatore]\n");      
  fprintf (file, "NrCodici=%d\n",FLista.Count());  
                                                   
  for (int i=0; i<FLista.Count(); i++)             
    fprintf (file, "%d=%s\n",FLista[i]);           
                                                   
  fclose (file);                                   
}                                                  
//-------------------------------------------------------------void TCompCodici::OpenFile()                       
{                                                  
  char  szBuff[121];                               
  int   i = 0;                                     
  FILE *file = fopen (".\\Cfg\\CompCod.dat", "rt");
  if (file == NULL)
    {
    ShowMessage("Error! Can't open file CompCod.dat");
    return;
    }
  while (!feof(file))                              
    {                                              
    fgets(szBuff, 120, FMsgFile);                  
    FLista[i] = szBuff;                            
    i++;                                           
    }                                              
}                                                  
//-------------------------------------------------------------

FLista is a stringlist.
My problem is that if i try to open file on my PC sometimes
error occours but if i copy all my folder on another PC all 
work correctly (always).
Could WinXP (API or somethingelse) give the problem?

Thanks.
Marco