TGYoshi : as items can be more complex than just a mesh, you must now import first the mesh (.fbx => .mesh.gbx), then the item (.item.xml => .item.gbx) for convenience, you can still create an item + mesh directly from the .fbx ( as before) : D:\ManiaPlanet\NadeoImporter.exe StaticObject Items\swag....
oups, sorry I forgot to post the cmd lines for the sample assets NadeoImporter Charskin Skins/Models/ArenaPlayer/SintelSample /MaxSize=1024 /SkelSocketPrefix="_" NadeoImporter Charskin Skins/Models/Minion/ToadSample /MaxSize=1024 /SkelGeneric NadeoImporter Item Items/Samples/Characters/Sin...
this skin uses a generic skeleton (not a vanilla humanoid skeleton) so you must specify the /SkelGeneric parameter : NadeoImporter.exe CharSkin Skins/Models/Minion/ToadSample /SkelGeneric