EXT file extension is associated with E-mail Text Attachment. It contains data in a plain text format and can store various sets of photometry information.File extension errors generally occur when the appropriate program is not installed in your system. Scan your system to identify and fix EXT file extension errors.
Trouble opening EXT files on Microsoft Windows?
Advanced File Optimizer
Need help opening a EXT file? Advanced File Optimizer will do this for you. Opening a EXT file only takes a few clicks and is very easy, even for novice users.
Compatible with Window XP, Vista, 7, 8, 8.1 and 10