| I don't believe you can scan a file that you haven't downloaded :/ . Simply "downloading" a file won't necessarily get you infected. Running the file is more of the dangerous part. Generally I have a folder which I download any suspicious or unknown files to, everything within that folder is renamed to something like yaddayadda.unknown or yaddayadda.virus - this ensures I won't accidentaly execute it while poking around even if double-clicking etc. You can then generally upload the file to a scanner quite safely and see what they have to say.
A person can download all the viruses/trojans in the world and not infect themselves so long as you handle things properly. But by all means if you're not comfortable with messing with such things and believe something is infected just don't download/run it and move along to somewhere else. Nothing is ever 100% safe so sh*t still happens and if you're not comfortable with it you should definitely leave the things alone.
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