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No, folders usually do not have file extensions, but they could have if you like. Usually only files have extensions, to indicate the contents of the file.
JPG,GIF,Bmp
They're used as extensions to identify picture files.
MP3 sound files have an .mp3 file extension, and common file extensions for raw, uncompressed sound files are .wav and .aif. Pg. 474
video files (mpg file extension, MPEG file format). It is the same video file format. You can use booth file extensions.
Windows hides file extensions in File Explorer by default for known file types to simplify the user experience and reduce clutter. This setting can be adjusted in the Folder Options menu, where users can choose to show file extensions for all files. The option is typically turned on for security reasons, as displaying extensions can help users identify potentially harmful files. To view file extensions, users can enable the "File name extensions" checkbox in the "View" tab of the Ribbon in File Explorer.
There is list of programs that support DO file extension http://www.howopen.org/en/extensions/web-files/do
File extensions tell us what kind of file it is.For example, a .pdf extension tells us that it is an Adobe Acrobat file.Files with the extensions of .jpg, .jpeg, .png, and .bmt are all picture files. (This is not an extensive list of picture files, just an example).Other types of files like .doc, .dot, .dotx, .docx, are Word files. There are many more file extensions for that.Powerpoint files have extensions like .ppt and .pptx.Windows media files have extensions like .wmv.Every software program has its own extensions that identify what it is.In Windows Explorer (or Apple equivalent), you can organize your files by file type if you're looking for a specific type of file. It's also really helpful if you're tracking statistics on file types and usage, or finding a file that you need to use again.The sort by file type feature is very handy when you have a high volume of files in a directory and you're looking for a document of a specific type.If you don't know where you placed your file, you can do a global search on the file type (if you know it) and your computer will give you search results showing only the files with that extension.
Emails are not files, so they do not have extensions.
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Rules for file extensions are based mainly on the underlying operating system and/or file system. Generally speaking, file extensions are just a part of the file name, and can be set to whatever you like.