Binaries
UNICODE version: diff_ext-1.9.1-i386-UNICODE.exe
Non UNICODE version: diff_ext-1.9.1-i386.exe
AMD x64 UNICODE version: diff_ext-1.9.1-AMD64-UNICODE.exe
AMD x64 Non UNICODE version: diff_ext-1.9.1-AMD64.exe
Intel IA64 UNICODE version: diff_ext-1.9.1-IA64-UNICODE.exe
Intel IA64 Non UNICODE version: diff_ext-1.9.1-IA64.exe
Sources
Windows: diff-ext-1.9.1.zip
Unix (Nautilus extension): gdiff-ext-0.3.2.tar.bz2, gdiff-ext-0.3.2.tar.gz
Unix (Konqueror extension): kdiffext-0.4.0.tar.bz2, kdiffext-0.4.0.tar.gz
Unix (Thunar extension): xdiff-ext-0.2.0.tar.bz2, xdiff-ext-0.2.0.tar.gz
Older versions
Older binaries and sources of diff-ext are available from project page at sourceforge