Reassign Default Program Used For File Extension On Mac Os

When you open a file on Linux or Mac OS X, the operating system doesn’t just rely on the file extension. In fact, if you make a text file on Linux, it will often have no file extension at all by default. File extensions, those bits of text that follow a period at the end of a file (like.doc,.html, or.jpg) were optional, although often used for compatibility with other platforms and with web. If you found a found a better movie player, text editor, or image viewer you may want to use that application for all files with the same file extension. For example, QuickTime Player is the default application for viewing MP4 movie files on OS X, but VLC could be your media player of choice.

File Extension Meaning

File Extension Definition

By • 6:00 am, August 19, 2013 • In OS X, all file types have a default application that opens when you double click on them. If you double click on a PDF file or a PNG file, chances are that your Mac will open it in Preview, Apple’s default PDF and image file app. If you’ve given an app like Adobe Reader, for example, permission to set itself as the default PDF app, then all PDFs will open in Reader. Over time, you may have set apps as default that you no longer want to open your files.