Using your favorite text or code editor, create a file in that folder called macworld.css. Once the file’s in place, switch back to Safari and the Extension Builder window.

If you find yourself doing repetitive tasks in your browser, it may be time to try writing an extension for Chrome or Firefox—with just minimal coding knowledge required.

Command Prompt lets you create all kinds of files on your Windows PC. Here's a guide explaining all the different methods to create a file using Command Prompt.

How to Create an EMF Format File. A file with the file extension of .EMF is an Enhanced Windows Meta File format graphic image. Enhanced Windows Meta File format is a Microsoft-specific vector ...