Maybe this is something you could do on your own, you just have to create two blank text files with notepad and save them as "character_wings_gold_mastery_left_01.pkfx" and "character_wings_gold_mastery_right_01.pkfx". Make sure to choose "any file" instead of ".txt" from the drop-down list when saving.
I hope this helps. =)

And where do a place it ?

Thanks for the help btw :D

You'll place them into \Live\particles\vfx\particles\override. Most likely there won't be an override folder in there, so you have to create it yourself.

Well, I did it but it does'nt work :(