How to know the file is clean?

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I mean there is a huge risk is infected, but... is there a way to test? Antivirus only?

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Hello, zurickleo!
The best way to know if a file is infected is by uploading it to VirusTotal and checking if there is any occurrence.
Search for VirusTotal on google.

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Just download from someone with high reputation ;P

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I also use VirusTotal, very effective. It detects most of the bad stuff.