[D Skin Master]

Yesterday i tried to crete .bsz file from .zip file like I saw on this page...
And I don't know why it didn't work...When I renamed SKIN.zip file to .bsz was the skin name SKIN.bsz.zip....TELL ME HOW CAN I CRETE .bsz FILE BECOUSE IN HAVE A FEW SKINS TO UPLOAD ON THIS PAGE--PLEASE

One more thing -> is there any program to do that? I mean to rename skins?