Every time I create a new wallet.
Also who had the idea on the design aspect to make users create new wallets every time they wanted to load a saved wallet from "Save Copy"? Why would you force users to create more addresses and go through what should be out-of-scope steps to use saved ones?
Haven't use the "portable" version of Electrum on Windows, lately, but...
Normally,
File --> Open will allow you to open any wallet that you saved with
File --> Save Copy, without asking you to create new addresses.
Please provide more info to trouble shoot your "user retardedness" issue.
There is "Restore a wallet or import keys" which has a file opener but it just puts the XML in the UI input and doesn't activate the next button..