Win32 application on a windows 64 bit platforms

Hello!
I run successfully a win 32 guided tour application on a windows XP 32 bit. Kind a bit worried if I can execute the application on a windows 64 bit. There are a lot of available platforms having a 64 bit windows such as Windows Server 2003 or windows 7. Keygen is not a problem with me. Just don't want to risk anything like this.
Thanks.
