This is a sticky for the development and discovery of the various file formats for FlyFF. I will basically cover what each file type is, what its for, and where you can find the format.
LND - Landscape File: - http://forum.ragezone.com/f457/lnd-file-format-557578/
This file holds all of the data for the landscapes in the game. For example it stores hightmaps, which tile to paint where and collision restrictions. It also has the coordinates for each object like houses, pipes, etc. It also holds where the SFX are at. You can find the format in basic layout at Xadet's web site here.
O3D - Object Model File: http://forum.ragezone.com/f484/o3d-format-636686/
This is the file that holds all the verticy, lines, points, etc just like a 3dmax file but in a different format. This is what the client loads for all the objects in the game. This does NOT include bones, and animations. Those are separate altogether. The format is being worked on in the development section by Divine, Duotone and others.
DYO - world npc and ctrl spawns http://forum.ragezone.com/f457/dyo-file-format-578809/
RGN - area region and spawns region http://forum.ragezone.com/f457/regio...format-579209/
RES - Packed file tge client reads from http://forum.ragezone.com/f457/res-file-format-568781/
SFX - special effects: http://forum.ragezone.com/f484/sfx-file-format-623163/
ANI - Model Animation files: http://forum.ragezone.com/f484/flyff...7/#post5538116
WDF - Packed file from Cflyff: http://forum.ragezone.com/f457/wdf-<...format-583147/
Edit by Reimniess July 2nd 2010:
noticed the thread was way out of date so I added all thee file formats to my knoledge that have been released

