1- Rip the icons: http://www.thugsatba...ab/?q=other_tabiripp
2- Manipulate the png's with Gimp or ImageMagick or PIL (whichever works best and fastest)
3- Pack them back together with your favorite icon editor. I've been liking IcoFx
If you want a command-line tool for the re-packing, Matthias Brenkmann's png2ico doesn't do 32-bit icons, so go to http://mattahan.devi.../art/GANT-3-15364715
and download the icon package. Inside is a nifty utility named png2ico written by Andreas Verhoeven (of AveDesk fame
...) that does 32-bit icons. It takes a trip through the help to get the hang of it, but basically it takes all the pngs in a folder and transforms them into bundled ico's at different sizes. The only drawback is it starts with a png and resizes, so start with the biggest one you can extract.
Here's the batch file I use. Just drop a file of 128 px pngs on the .bat :
png2ico.exe -s 128 32bpp -s 64 32.bpp -s 48 32bpp -s 32 32bpp -s 24 32bpp -s 32 16bpp -s24 16bpp -s16 16bpp -i %1 -o %1\icons\