I agree with mkbkr1, I either put it on my sd card or use ROMtools to push it onto the phone. Just make sure you have a good recovery like xionia 12518.4 VM Recovery. I was using a different recovery (can't remember which one) and ran into problems when I was testing different bootanimations to see which one I liked better. After like 15 different animations, it just went black where the animation should be. I changed the recovery to xionia and it fixed it. By the way, I never used a command prompt to work on my phone. Hope this helps.
I use ROMtools so I don't have to use command prompt. Just put your .zip file in the boot animation folder, rename it 'bootanimation', double click ROMtools and enter option 7 and follow the prompts. Only takes a second. Quick and easy with no command prompts!!