I find it easier to click the View All button on the Welcome screen, then click the trash icon on all the Auto Creations I don't want to keep, but thanks for pointing out where they are in the filesystem on Windows 🙂
For some, for whatever reason, that isn't an option--- we turn off auto creations and yet some still appear. One gentleman in another thread had 1 autocreation he could not delete, using the standard method you described. Of all the autocretions I had seen, for me, none of them was anything I would wanna keep, or share with anyone. There are tons of free tools that can make way better slideshows, with thosands of percent more control.