These window sprites only work in 32,000 colour modes or higher, so there's no point in downloading them if you never use a 32,000 or 16M colour mode or you don't use a RiscPC or A7000.
Personally, I think these Icons look like vomit, I designed them because I was tired of the boring grey ones which came with the computer.
To download these icons, click here, full installation instructions are included inside the archive.