Technically, no. Nero 9 was primarily a 32-bit application suite. It was designed to run on Windows XP and Vista. However, like most 32-bit software, it was compatible with 64-bit versions of Windows through the Windows on Windows 64 (WOW64) compatibility layer.
While often searched as a "64-bit" version, Nero 9 is natively a 32-bit application. It is fully optimized for using a 32-bit emulation mode (WoW64). Nero 9 Ultra Edition 64 Bit