I love URL sleuthing so I did the following investigation.
Interestingly, the direct link for Create-A-Pattern is:
http://gb.thesims3.com/content/global/images/cap/TS3CAP_767618.exe
which is from the official Sims 3 servers.
http://gb.thesims3.com/content/global/images/cap/
So similarily, is Create-A-World something like:
http://gb.thesims3.com/content/global/images/caw/TS3CAW_######.exe
Anyone have an idea what the "767618" stand for? Version number? A date?