As you all know, I'm a newb.......when I open the BBDesktop manager, application loader, and browse looking for all files to find the the slacker_mobile.jap file, it says " No additional applications designed for your device were found ". I feel that I am somewhat savvy on a technical level, I guess this contradicts that.
You can also also store in .jad on your media card, go to your media folder, select "explore" from the BB menu, go to the .jad file and click (select) it.