>>At first I was using memory allocation (lcValue = lcValue + lcAddString. But of course that's the worse as soon as the string is growing, so I changed it using FPuts.
>>
>>To optimize it, I create the sections in memory and then add the section to the file. So it does go pretty fast and most importantly, does not slow down as the size grows.
>
>Do you have any C/C++ coding experience?

No, but I would love to be able to do that. There are many places I would like to optimize, but has been kept from doing it because of lack of experience. That is also one reason I am looking forward for your project, because I might learn something from it.