Well.. Hello everyone !
Today i'm up with a new problem : Black faces on a mesh i'm working on.
I imported the "XMS_Flora_MeshHair081" hair mesh to work on it for personal project, and what i have when i import it in milkshape is the mesh but with strange black faces... I tried almost everything (I think) : Disable Autosmooth, "Smooth all", "Align normal"... Nothing changes... I'm quite lost now, could someone help me with that ? Thanks !

Here is a screen to see what i'm talking about :

What happens when you hide all the groups, and only unhide the higher number of each pair? Your pic looks like what happens when you have the top side and underside both showing at the same time.

Hairs are usually paired in groups - so if you have, for example, hairalpha1, hairalpha3, hairalpha5, and hairalpha7, then the ones that will be on top are hairalpha3 (its pair is hairalpha1, which is its underside) and hairalpha7 (its pair is hairalpha5, its underside).

If you're dealing with a hair that has duplicate groups (something some creators do, but hairs from the game never do), you can only see this in SimPE - you'll see something like hairalpha5 several times - you will have to rename these groups in SimPE before you can import them into Milkshape. Otherwise, Milkshape will combine them as it can only have a particular name for a group once.

Mmmmh.. i got "Hair" and "Hair_alpha5" in the groups... "hair_alpha5" is the group showing in the pic. "hair" is the scalp of the head. If i hide "hair", nothing changes on "hair_alpha5".
And in SimPE, i got also only "hair" and "hair_alpha5".

You had autosmooth on the first time you imported the mesh.
Extract it again from SimPE and open it in Milkshape with autosmooth off
It looks fine when i imported it with autosmooth off

Haha, worked ! Thank you very much =)