Posts from Heroes 3 WoG Era II, .pac archives.
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pac can be opened with WinRAR, right?
That's strange. I can access the data.pak file in Heroes 5 using WinRAR, without even changing the file extension. I simply set "use this application for all files of this type" in the properties, and I haven't had any problems since. In Heroes 3, it's obviously different.
Ah, well then, everything makes sense now. Heroes of Might and Magic V simply has a different format.