I wondered about that as well. It doesn't tell you anywhere in there that it is only compatible with 32-bit OS's, just which OS's it will work with, and you don't find out that it won't work with 64-bit until you try installing it. Fortunately for me, I run two desktops through a KVM, and one is running Win7 64-bit, the other Win7 32-bit, so I can just transfer the files from one computer to the other, and then just use the one with 32-bit for managing the files on my phone. I know others aren't as fortunate though, and are only running one computer with 64-bit on it, or multiple computers all running 64-bit. It would be nice if there was a 64-bit version of the Media Manager released at some point.