Ani=All the ANImations.
Lithtech works in a funny way. The way they make it so one LTB holds several animations is you actually import several animated models into 1 LTA file and save it as a complete Animated LTA for editing later or a compile it as an LTB to use in the game
PV=Personal View
PV is just the view from a players perspective. These rarely hold animation but as a modding community, generally we run into issues with these models and actually have to replace these intead of the ani files for our conversions to work
All in all, a word of warning...
I got a letter from nexon stating to stop using their 3d models in other projects (hence why TPS haulted.) THAT BEING SAID be careful converting their models, THEY WILL TAKE ACTION