AW67,
Welcome to the forum. Creo/WF have always created the .1, .12, .100 extensions to the parts and assemblies everytime you save them. They are called versions. They index everytime you save a part/assembly. You may have had them hidden before, but they have been there.
The usefull thing about them is that if you have been working on a part and something didn't work out, you can go back to an ealier version.
They do tend to take up space, hence you see the discussions about purge them periodically.
Thanks, Dale