just drop a file (i dropped the .zip file on it) then it made a folder on the desktop as promised called Heliopolis. To reassemble all you do is just select ALL the PIECES and drop on the pheonix. Like a couple others said it is crude but it's free and it DOES work. One question to the developer what about when something is emailed or burned on a cd then transfered to another computer how do you reassemble? (mac would be no problem just download this software to reassemble. But what about a pc? Call me curious?