It may be that "Heather's Final" does not have an extent, that bit after the "." that lets us know what the files are for. Or it may be that the letters after the "." aren't recognized by the operating system. To fix this, find "Heather's Final" and right-click on it, then click on Get Info. The resulting box will show in the "General" section the kind of file that the OS thinks the file may be, and in the "Open with:" section the default application to open that kind of file. To change the default application, click on the lock bottom right and enter an admin login and password, then on the little up/down arrow on the right of the window that shows the default application and pick the application you want. If it's not showing, click on "Other..." and navigate to where the application you want to use may be. Assuming that you get that done, if you are very, very confident that you want all the same kinds of files to use the same application, you can then click the Change all box to change the default for all the files on the entire drive that have that same "Kind" quality. I'd be leery of that myself, but it's up to you.
