Need help recursive treeview fill.

Hi guys, I have come across a problem, I am trying to populate a treeview with a data scheme, the data scheme is files within a folder.

ONE.file
ONE%%TWO%%THREE.file
ONE%%TWO%%FOUR.file
ONE%%FIVE.file
ONE%%SIX.file
ONE%%SEVEN.file
AAA.file
AAA%%BBB.file
AAA%%CCC.file
AAA%%DDD.file
AAA%%CCC%%EEE.file
AAA%%CCC%%DDD.file
FFF%%AAA.file
FFF%%AAA%%BBB.file
FFF.file
FFF%%AAA%%BBB%%AAA.file

THE NEXT FOLDER COULD READ:

AAA.file
AAA%%BBB.file
AAA%%GGG.file
AAA%%GGG%%DDD.file

THE ABOVE IS A GENERIC VIEW OF WHAT EACH FILE MAY LOOK LIKE... NOTICE HOW THE CHILD NODES ARE THE SAME NAMES SOMETIMES AS THE MAIN NODES.

I need it to read;

One
|-TWO
| |-THREE
| |-FOUR
|-FIVE
|-SIX
|-SEVEN
AAA
|-BBB
|-CCC
| |-EEE
| |-DDD
|-GGG
| |-DDD
FFF
|-AAA
| |-BBB
| |-AAA


Whenever I read the files I always seem to get duplicate entries. How can I overcome this? Thanks in advance.