By installing Attachment Icons for Gmail, you'll be able to quickly identify if it's a PDF, MP3, ZIP, or any other common file type attached to your e-mail without even having to open it.

Icons for games and computer websites are saved as a .ico file extension loosely called icon files saved in an "ico format." If you have an image that you want to use as an icon on a device or ...

A JPEG and JPG are the same thing, but file formats typically only have three letters so the E is dropped in ... you can check the file type by clicking on the photo in the Camera Roll (iPhone) or ...