WHAT DOES AAE FILE MEAN?

I also identified unintentionally that there is a new Photograph software in my programs folder in working system Yosemite, Prophoto or some thing, and I do not know if this is the new edition of iPhoto and Aperture blended in a single. I am wary of using iphoto since it doesn't do the job perfectly with Lightroom workflow sensible.I just discovere