File design C++ or ?

I wish to build a file with three indexes.  The file is expected to grow
forever.  First it will fit on a 3 1/2 disk, then it will have to have
200k, then it will have 1 gig, then it will have 10 gig.  Where it stops
no one knows.

The application will most likely first be on windows.

Like a customer database of the world, the data is geographic.  I thought
that I would allow the database to be split geografically as follows:

Each file (database and 3 index) will be named with a geographic name
composed of country 2 characters,  2 characters state, 2 characters city.

Example:
Start  DBAF__BA.DBD for database starting with Afghanistan Baghian
          DBAF__BA.IN1  for 1st index
          DBAF__BA.IN1  for 2nd index
          DBAF__BA.IN1  for 3rd index
When the file had to be slpit for any reason (index too big, not enough
disk space on disk) I would split the file and create a set of files
representing half way
into the data.  This is like when a box is full of file, you just get
another box and split the files a-k and l-z.

I am new to PC development and would appreciate any discussion on this
subject.

Becaue I have C++ (Turbo C++) and am learning C++ for PC Development, I
guess that I would use C++ for this file/index setup.  I need help, if you
have examples of any piece I would appreciate it.  Would you use a
database interface?

Any comments welcome thanks.

Geoffrey Hebert
email Heberts@aol.com