It's normal the archive <strike>must be</strike> IS a solid one (all the files are compresseds as a single big file) it's a technic that help to reduce size even more (drasticly on files with very fews differences like, for EXAMPLE; roms of diferents regions or languages....)
But the conterpart il that when you want one specific file it have to uncompress every file that been interlaced with the one you want.
In the end you'll only get the files you asked for.
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