I just got back from a vacation and came home and one the children must have done something.... I go to rename files cause I like to keep everything tidy and now I have to put file extensions on the end of everything. Every file now shows the extension of the file and its just a pain in the butt. I am sure its just a customizable option that was enabled and I would like to know how to get rid of it.
If you go to the folder that the files are in then go to Tools at the top, then folder options. under the view tab you will see a section called advanced settings. Make sure the box next to "hide extensions for known file types" that should do the trick.