ATF - Axon Text File is a file extension that is used by GenePix. It is an analysis software program which mainly uses plain text. It also consists of records that contain various fields for you to take advantage of along with this extension. You will also be able to use this extension along with Excel if you decide to combine a spreadsheet. .GAL and .GPR are a couple of other formats that this program uses. There are different features you can take advantage of with this extension. You can also use this extension with text editors as well. Again, you can only use this extension if you are already using GenePix.