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Try changing your password quickly.
No. Uploading the file bypasses the need for a SteamGuard code. It does not give them access to your e-mail.
I suggest clearing your SteamGuard permissions. You can do that in the settings on the client.
Companies never ask you for passwords, or to upload files or things like that. That should be common sense in 2014.
Deauthorize all other computers via your Steam Guard settings? Not may more options. You should be okay though, as long as you didn't enter your account info.