So you download files and submit it to VirusTotal before opening locally? Yes. Are they free or they charge when you increase usage? I believe they do have l

So you download files and submit it to VirusTotal before opening locally? Yes. Are they free or they charge when you increase usage? I believe they do have limits for free usage but I have never hit them. Businesses have paid relationships with them to use their API. What about private/sensitive files The only executable files that fit the description would be 0-days that friends created in my prior professional career and those files I knew were malicious by design so I would not submit them unless I wanted to trip up their demonstrations. For anything that appears to be multimedia but may have come from an untrusted source I will analyze the file myself using open source tools or if in doubt I will just delete the files.