~snip~
- Never in the install process was I asked to create a password for this default_wallet or received a seed key. It just opened after I clicked next on the intro screen.
Are you sure about this? This is impossible to happen you might be using bitcoin core wallet, not Electrum wallet?
If that's the case the only thing that I know to open this wallet is by brute-forcing the wallet file of Electrum. If you don't know how to do it check this link below.
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Password recovery guide by BTCrecovery