Blackberry Installation

I have gotten the Zfh working great for our Pocket PC devices. However
when I try to install the client on and Blackberry devices, it doesn't add
it to the Application Loader, and when I try to do it manually, it tells me
that no additional applications designed for my handheld were found. The
..alx files exists in the directory etc. Any ideas where I went wrong?

Thanks,
Dave