The symbol download packages are listed by processor type (x86, Itanium, and x64) and build type (retail and checked). Almost all customers require the symbols for the retail version. If you are debugging a special version of Windows with extra debugging information, then you should download the symbols for the checked version.
Windows XP and later and Windows Server 2003 and later do not require localized symbols in order to debug localized versions of the product. Each symbol download package for these versions of Windows works for debugging all localized versions.