It is an IBM Writing Assistant text file. It is a DOS application. A text file stores simple words and text with minimum formatting and no support for images or tables. The file is made up of ASCII characters and they are made up of one byte each. This character set can be read by any text editor.
Trouble opening IWA files on Microsoft Windows?
Advanced File Optimizer
Need help opening a IWA file? Advanced File Optimizer will do this for you. Opening a IWA 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