Fonts Ninja

Different Font File Types Explained (OTF, TTF, WOFF)

Show File Name Extensions in Mac OS X

Common file name extensions in Windows - Microsoft Support

Understanding font file formats(ttf, otf, woff, etc) - Snapfont

Rename a File Extension Easily on Phone, PC or Mac Computers

windows 7 - Use File TypesMan to change extension setting, but it show this file type may affect the following extensions - Stack Overflow

What is a 'File Extension' ? - Website Creation Workshop Blog

What is a file extension?

How-To Configure Windows 7 to Show File Extensions

What Are Font Files? Learn History and How To Open