Did some spelunking to find some free Icon editors for Windows icons. So far I found:
- IcoFX - a freeware icon editor. It works with Windows (XP, Vista, 7) icons formats and supports transparency.
- @icon sushi - a freeware image to icon converter and mask editor for the creation of Windows (XP, Vista) icon formats.
- JDraw - described as “a pixel oriented graphics editor designed especially for small to medium-sized pictures used to decorate web pages”. It is an open source Java program that works with (animated) GIF, ICO and PNG formats. Unfortunately, JDraw did not work with multiple images in the ICO files I wanted to edit.
- PNG (ICO) icon create utilite - a “web-app” that produces simple flat PNG and ICO files.
IcoFX worked best for me because it supported the Windows icons I was editing. YMMV.