Ment
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You take the contents of the archive and put them in the game folder (not necessarily, but it's easier that way). You launch the console or, better yet, a file manager, and in it, you launch the executable file. For example, you type zip2orc.exe Data5.orc, and then you wait for a while, and a file called Data5.orc.zip will appear in the folder, which can be opened with WinRAR. I don't remember which specific .orc file contains the music, but I wrote about it in the thread about music in Heroes 6.