format for data storage?

I need to store a lot of data(mostly text files) into a single file.
I programmed a interface that is a hierarchical tree (shown below)
What format should I store the data so I can access it through the
interface, maybe ZIP, a Database, or other. I looked at B-trees,
BTW, my file system is NTFS. The program MyInfo seems to put all
the data into a single ZIP file. Databases seem to be better chose
but, I don't know.

Please help me find a solution. Thanks, for your help and your time,

Josh

Node A1(2090kB)
Node A2(45kB)
Node A3(20kB)
Node B3(15kB)
Node A4(10kB)
Node B2(900kB
Node C2(450kB)
Node A3(400kB)
Node D2(50kB)
Node E2(200kB)

.

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