http://dev.mysql.com/downloads/mysql/5.1.html#source
Source downloads
Note that in the more recent MySQL 5.0 and 5.1 releases, Windows binaries are built from the same source as the Unix/Linux source TAR. 注意:在最新的MySQL 5.0 and 5.1 发布版中,windows 的二进制执行文件均由与unix/liux相同的源代码编译而来。(本人翻译,与MYSQL无关)