Appears when you choose Save Copy As.
Save Copy As displays a standard Windows save dialog. Save Copy As increments the number at the end of the file name in order to propose unique but similarly named files each time the command is used.
Clicking the Save button saves the file to the name displayed in the File Name text box.
Tip: You can resize the dialog by dragging an edge or a corner.
Clicking the plus button saves the file with a name ending in a number one increment greater than that displayed in the File Name text box.