It just changed the association. The air files should still work fine in FS. If you had the .air filetype set to open with an airfile editor, you should be able to right-click > open with and select your editor, checking the "always use" box. Personally, I just use the drag & drop method to open mine. I just drag the air file onto the icon for either AirEd or AAM and open them that way.
Adobe Air is (I think - I could be wrong) a cousin of Adobe Flash, but I haven't seen it catch on like Flash did.