As a standard rule, any existing file should be warned before hand to be overwritten by the same name and AP does this and it successfully saves the new file over the same old project (by default, the name will be "untitled.approj".
Reg login, once you login in the home page of this communcity, you can straight away read/reply posts in this community. (After login in the Home, pl check up on the right hand side of the top menu item "hello (member name)".