The PSP version of POWDER was made from this. POWDER V.71.3 FOR PC.
Version 71.3

* Enable use of caching server to improve performance or thumbnail retrieval.
* Fix issue where sign tool creates invalid walls
* Fix issue where LRBD/RBDM isn't ignited by WATR
* Fix crash on rotating a stamp with walls as wide as the window
* Fix Invisible photons
* Fix bug where WARP+SING destroys DMND
* Fix issue where Lua can't create photons in glass


Here is the Link
http://powdertoy.co.uk/
Download it from there

AND
If you want to play it online with tons of more options:
http://dan-ball.jp/en/javagame/dust/

3NJOY!