Whenever I open a StarCraft MPQ file with PyMPQ, there are a few files at the very bottom that are marked as unknown. They are labelled "Unknowns\unknown_", followed by a series of numbers and letters after the _. There is no file extension. Even when I extract the files, my computer does not display any file extension. Under "File type", my computer just displays "File".What could these files be, and how can I access and modify their contents?

I have 2 of them in both StarCraft.mpq and BroodWar.mpq; in both cases, they're wavs of the "swish in/out" of the menu UI. I also have 4 in StarDat.mpq, which appear to be portraits. Not sure if they're the same files as me, but you can open/edit them by giving them the appropriate file extension (.wav or .smk, respectively).

Same as DF. Portrait files are, in order, Khaydarin Crystal (or some variant), static, static, Khaydarin Crystal. The static is presumably used for a few frames when switching between selections.

If you have more than the described unknowns, you have an old listfile or something.