Is there a binary version of HDF5 for 64bit application?

    I previously created a Dll of 32bit version base on HDF5DLL.dll, and now I am going to make a x64 version on Windows 7 64bit OS, is there an exsing binary of HDF5DLL.dll of 64bit version, or do I need to build it from source code, and how? Thanks for help!