Why i686 updates in x86_64 directory?

Sat Jan 16 21:53:23 UTC 2010

On Sat, Jan 16, 2010 at 15:47:07 -0600,
  Jim Haynes <jhhaynes at earthlink.net> wrote:
> If I may ask, why does a directory like
> download.fedora.redhat.com/pub/fedora/linux/updates/12/x86_64
> contain a bunch of i686.rpm packages in addition to those for x86_64?

Because you can run both 32 and 64 bit binaries on such a system and
some 32 bit libraries are needed to support that.