This is a wild pokemon encounter data for Pokemon X/Y.
Its design is based on BWWE, but unlike BWTE, there's no code copy/pasting.
Wild encounter data is in a/0/1/2. Use Kaphotics's GARC Unpacker (Check .bin extension only and make sure "Don't decompress" is UNCHECKED.)
A correctly extracted GARC should have 361 files -- dec_000-dec_359.bin, and 360.bin.
If there are any other files in the folder you open with the program, the program will refuse to open the folder you specified.
The Source Code for XYWE is available on my GitHub.
XYWE.zip