The .000 extension is added when a profile with the same name is attempting to use the local computer.
This usually happens when logging into a domain profile when a local profile with the same name already exists.
For example, there's a local administrator profile on the box and you log into a domain that hosts its own administrator profile.
The local computer will then grab the administrator profile from the domain controller and copy it to the local box, adding the .000 extension. If you do this twice, it will add a .001 then .002 etc...
Lesson to learn, either host your profile entirely from the domain or make sure to log into the local box and
NOT the domain when using that profile.