Help with custom stories

[Mudbill]

That's quite a necro you got there. Anyway, by extracting it's meant that you take the files out of the archive they're in. When you download a .zip or .rar, the files are compressed in these archives. Extracting is simply moving them out of it, which expands them to their original size and makes them fully usable.

If your RAR files have IExplorer as their default, download and install an archive manager like WinRAR. ZIP files are standard, but RAR files are not.

PS: What you're referring to as "map" is called a folder in English. A "map" is something else, including these things in the custom stories as playable levels.