It is FoldersTree(TM) control by Extreme Code(TM) Software.

For the license see doc/license.html .

For installation notes see install.html . Note that accordingly to the
license, if you will write a good object oriented wrapper for the
library, you MUST send it to us. (You can send it to porton@narod.ru .)

For detailed description see doc/index.html .

Currently only direct Win32(R) programming is supported, but the support
for some GUI libraries is to be added.