First visit http://www.telegraphics.com.au/sw/#icoformat and download the true version (32 / 64 Bit) for your OS (Mac / Windows / Linux)
Attention: at this time I could not get 64bit Plugin (... .8BI) works on 64Bit Windows7. But when I copied the 32 version of plug in I coult get it run on both 64 bit and 32 bit CS4. Also use "ICOFormat-1.6f9-win" instead of "ICOFormat-1.93b1-win64" below.
Extract files to folder (ICOFormat-1.93b1-win64). There is one .8bi file and gpl license, readme etc.
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