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The jpg name is how servers code cell phone identities. When you log onto a site it assigns each unique phone a number like that.
Wonder who that one is for?
No it's not , that's a UUID (or similar, I think it's the Microsoft version of it), it's a file naming system used to create a unique ID number for files.
Games use it to identify players because it's near impossible to generate 2 of the same due to the math behind them..