Okay. Since everyone is going around saying FIB is a virus, ill explain how it's not.
First things first. Just to get things cleared up, there can NOT be a virus/malicious program inside data files. Why you ask? Because the games data is just big TEXT files that are compiled together to make the game know what you can or cannot do. There CAN be a malicious program/virus inside the .ZIP OR .RAR. If you see something other than .res files then feel free to scan and whatever. I suggest you don't use/download ANYTHING that has something other than .res files and/or FIB.
Now. The reason FIB has backdoors and other things that virus scanners detect as harmful is because it's made with Cheat Engine(Cheat Engine). As you all probably DONT know, Cheat Engine is made to have hidden backdoors, etc so it can attatch itself to a game of your choice without getting detected as malicious. Someone SO kind made FIB into an executable(or in other words an .exe)and made life that much easier

If anyone would like to try to make a FIB then here's how to do it with Cheat Engine
Cheat Engine :: View topic - [PATCHED] All you need to bypass edited .res files! (i dont THINK it's patched since FIB obviously isnt)
If some of you want to learn how to do it with a
CE and can't comprehend it, please feel free to ask here.
NOTE: I do NOT know how to make it into an .exe, I just know how to do it with
CE and save it as a CT(Cheat Table). Although I havent played flyff in a while, im pretty sure it works.
Well since everyone new to the flyff section doesn't know, you CAN dual client with BOTH of the clients edited. What I mean is you can have BOTH of your characters have 100% aspeed and all that good stuff. I'm not sure if this still works but im pretty sure it will.
Instructions:
Have two accounts both on your COMPUTER and FLYFF. Make a different account on your computer with a PASSWORD. If you already have another account with a password, skip this part.
Be sure you have Flyff on windowed mode.After you've done that, run IB and log in with your FIRST character. Next, right click your IB and click "Run as..." Pick the account that you made a while ago on the dropdown window and type the password and hit ok. Just wait a while and another flyff should come up. Yayz I r dual-clienting with 2 edited .res files!
Again, i'm not sure if this is patched but it shouldnt be.
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Added a way to dual client with both flyffs having edited files.