Download POWDER for Windows CE/Pocket PC/Windows Mobile
Version 111, developed by Jeff Lait, built by Ilya Kasnacheev.
If you're on desktop, download the first file, unzip it, transfer CABs to your device and install by opening (clicking on them in Explorer). Only install powder-ibsons.CAB if your device has 640x480 screen, activate it by going Options → Tiles → From Disk....
If you're looking from your PDA, just download powder.CAB and, maybe, powder-ibsons.CAB (see above).
powder-barebone.zip contains all the game files. Use it if you dislike CABs or if you know what you're doing, anyway.