Late to the party but there seemed to be some confusion over what all the files in the OP's zip did, so here's a quick rundown (so you know what's safe to use or ignore). Bear in mind the OP's zip isn't intended to be flashable! Use Root Explorer or similar to manually copy/replace the files.
bootsamsung.qmg (MANDATORY)
Stock T-Mob: Animated, colorful Samsung "explosion" logo (black background)
International: Animated, colorful Samsung "explosion" logo (black background)
First startup animation. Identical for both the stock T-Mobile and International versions. You must have a bootsamsung.qmg file. If you do not, you will not be able to get a lockscreen again after the phone has booted and has been unlocked once, either by pressing the power button or by letting the screen timeout. (It also causes persistent brightness problems any time the screen dims, and it looks ugly as the initial post-boot lockscreen components render from black piece by piece, but those are hardly the main issues here!)
bootsamsungloop.qmg (OPTIONAL)
Stock T-Mob: Static "T-Mobile 4G LTE" logo (white background)
International: Animated Samsung logo with particle effects (black background). A direct continuation of the bootsamsung.qmg animation
Second, optional startup animation. It will continue to loop after the first animation has finished until the phone has fully booted. If you delete bootsamsungloop.qmg, the phone will just continue to display the final frame of the first animation until it's fully booted.
bootsamsungmini.qmg (OPTIONAL ??)
Alternate startup animation used when the S-View cover is in use. Sadly I don't have an S-View cover to test with, so I can't tell you what they look like. This is optional if you do not use an S-View cover (at least I can see no ill effects). However I don't know whether deleting this file will cause lockscreen problems if you do use an S-View cover.
bootsamsungminiloop.qmg (OPTIONAL)
Similar to bootsamsungloop.qmg, this is a second, optional startup animation that plays after the first animation (bootsamsungmini.qmg) finishes when using an S-View cover. (Again, no S-View cover to test so I can't tell you what these look like, sorry.)
shutdown.qmg
Stock T-Mob: Static, white Samsung logo followed by static T-Mobile logo screen (black background)
International: Animated, colorful Samsung "implosion" logo (black background). Almost a reverse of the International bootsamsung.qmg animation
Shutdown animation played during power off/reboot. Delete shutdown.qmg and you will simply get a popup notice reading "Power off. Shutting Down" overlaid on the home screen until the screen goes black and the device shuts down.
shutdown.qmg.cover
I believe (not certain) that this is an alternate shutdown animation when using an S-View cover. No ill effects if you delete this file altogether (obviously, since this file doesn't even exist for the stock T-Mobile ROM).
PowerOn.ogg (OPTIONAL)
Startup sound. Entirely optional, can be deleted for silent startup.
PowerOff.ogg (OPTIONAL)
Shutdown sound. Entirely optional, can be deleted for silent shutdown.