No and i found your errors
1.The .nft you make is a .nif if you dont understand it looks like this "P_LSleeves2.nif.nft" (You can press save and change is name in the lower part that it says "P_LSleeves2" add ".nft" to the end of is name and is done
)
2.The texture doesnt load (You have to do something like me "I make a folder where everyone will have it for example my folder in C local disk" if you put it in your desktop for example they cant have the texture in the same place nobody haves "C:\users\"yourname"\Desktop\p_sleeves.nif" and you have to load the image not the .nif)
I think that is all