do folders have extentions...
that's file system specific. To the best of my knowledge, though, most if not all File systems do not use extensions for folders as they are not files in the first place; they are subdirectories. I dont really know how to explain it further than that ^^;;
On most file systems a directory name can be any valid file identifier. Which means that you can name a directory something like "foo.exe" or "a.dir" or even ".baz". People don't generally do that, because it is stupid. Native FAT filesystems restrict extensions to 3 characters.
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