There are a few ways to rename and number files. To just have numbers, you would select Remove under Change Filename and either Before or After under Auto Number, then set your Start At, Increment, and Zero Fill. To just add numbers, select None under Change Filename, After under Auto Number, and set Start At, Increment, and Zero Fill. It takes a little experimenting to get exactly what you want. It's what you are used to. I like CK Rename because you can right click a folder to open it in CK Rename.