Legion model transformation

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In 3.3.5, I was able to easily convert the existing Frostmourne model into the clear Frostmourne model that the Lich King had with the mpq editor. However, the Legion client was unable to find the mpq file and had difficulty converting the model. After reading the article, it is somewhat understandable to find the model and texture id of a file with casc explorer, but it is not well understood to convert it to another file. Could you help me ??