Библиотека для работы с *.ico

А может проще самому написать? Али не программист?

а может проще найти? али велосипедостроитель?

Маленькой - не знаю. А так - ImageMagik умеет.

imlib?

http://ftp.gnome.org/pub/GNOME/sources/imlib/

http://www.enlightenment.org/Libraries/Imlib/

[17:07:32][3](501)$ apt-cache show icoutils
Package: icoutils
Priority: optional
Section: graphics
Installed-Size: 164
Maintainer: Colin Watson <cjwatson@debian.org>
Architecture: i386
Version: 0.22.0-2
Depends: libc6 (>= 2.3.2.ds1-4), libpng12-0 (>= 1.2.5.0-4), zlib1g (>= 1:1.2.1), perl, libwww-perl
Suggests: libterm-readline-gnu-perl | libterm-readline-perl-perl
Filename: pool/main/i/icoutils/icoutils_0.22.0-2_i386.deb
Size: 50036
MD5sum: 8f1959a848ed6dd8ce4cf3816d6c9d35
Description: Create and extract MS Windows icons and cursors
 Icoutils is a set of programs that deal with MS Windows icons and
 cursors. Resources such as icons and cursors can be extracted from MS
 Windows executable and library files with "wrestool". Conversion of
 these files to and from PNG images is done with "icotool". "extresso"
 automates these tasks with the help of special resource scripts.
 .
 This package can be used to create "favicon.ico" files for web sites.

ЕМНИП ico это тот же самый bmp. по крайней мере мне с ним так удавалось работать.