Typical folders found in Finder do not have extensions, much like folders found in Windows OS. However, if you are referring to disk images and so forth, you'll find the common extensions such as .iso, .dmg, .zip, and so on.
When a broken folder/sad face folder appears on a Mac it means the Mac can not find the start-up system folder.
The blinking folder icon with a question mark indicates that the Mac could not find a System Folder from which it could start up.
Folders have no extension.
Keep an eye on your spam folder.
Go to the folder in which the music is stored on the mac, then open the usb folder. Click and drag the wanted music into the usb folder.
Photoshop files use the extension .psd in Mac OS X.
A compressed folder can have many extensions. The usual windows extension is .zip. But .7z (for 7zip) and .rar can also be used.
In nokia mobiles renaming file or folder name with an extension (z.otb) we can hide
.FOLDER but you can't turn a file into a folder by just adding above mentioned extension at end of any file. but it's surely possible with any programming language. Folders are a part of Windows Explorer unlike files.
I have a mac so i really only know how to do it on a mac but i sort of know how to do it on pc.On Mac: Library>Application Support>minecraft folder>mods folder and if you wanna install a mod all u do is drag it in the folder Pc: if you know how to find roaming folders all you do is click on that and you will probably find the minecraft folder in there and just click on the mod folder, too.
Mac OS X stores fonts in both the Font folder in the Library folder at the top hard disc level and also in a individual user's account Library Font folder.
Boot Camp Assistant can be found in the Utilities folder (Applications/Utilities) on an Intel-based Mac running Mac OS X 10.5 "Leopard" or later.