Change Folder Icons using Png Files?

[SuperSport]

Does anybody know how I can use png files to change the icon for Folders and Shortcuts? I'm in WM 6.5 and I've tried everything I can find. I'd prefer a way to use a RGU or Provxml or Initflashfiles.dat when I cook if that's possible? Automation is what I'm looking for. I'd like to create a package with the png files included, and an RGU or whatever needed to lay it all out.

Thanks in advance! :D I really appreciate the help.