WTS Encoding troubles

WTS file uses UTF8 encoding, right?

I was using UTF8Decode when reading stuff from it and UTF8Encode when writing, the thing is that there are 3 bytes at the start of every wts file that become a ? sign when you decode them for no reason, would like to know what the hell are those bytes.

That are 3 bytes: EF BB BF
They are unicode signals, you can ignore them on reading and remove/retain them on writing, ;)

I was expecting that, but I still wonder why UTF8Decode converts them into a ? instead of '', but I will just handle those bytes