Thread:CAMERAwMUSTACHE/@comment-3338841-20190307171515/@comment-26573805-20190307223222

Turns out the .txt file contained links to where to download the Wii U files of the JDU songs from the official servers. Following those links in the .txt file yourself downloads an archive file onto your computer which is the legitimate files for the Wii U versions of songs on the JDU servers, which have an ipk, atlascontainer, dlcdescriptor, secure_fat, and sgscontainer just like DLCs are formatted as. Those are downloaded from the Ubisoft server.

So yes, Jackboog21 is correct on this.