Check for Virus in Single File Including Zip or Other Compression

dw85745 said:

If one downloads a file using a browser they receive a download dialog to save or open a file.
Questions:

1) Does Windows Defender check this file for viruses while it is being downloaded?
2) Does this check include compressed formats such as Zip or 7Zip open?
3) Once the file in on my system, is there anyway for me to check that "single" file
for viruses on my system -- ie NOT having to go out to a separate file checker site?

Windows Defender was released with Windows Vista and Windows 7, serving as their built-in antispyware component, so it's purpose is to remove spyware. To get rid of or check for viruses and other malware you will need to download and install an antivirus software product if you don't already have one installed... and if you don't, you should have.

If you would prefer not to upload the downloaded file to a site such as VirusTotal or Jotti's Malware Scanner, you should be able to right click the file and have your resident AV scan the file.

You can upload a file, 32 MB or less to Virus Total. Special considerations are available for files up to 200MB. If hash matches, results are instantaneous, if not, AV engines scan and produce result (takes a few minutes)

You can also download their app which adds option to Right-click context menu Virus Total Add To Context Menu
If program is an executable i.e., (.exe) you will still get popup to run. Click OK and upload etc. will occur without actually running the exe on your machine.

FYI lesser named AV engines sometimes produce a false positive or two.

Don't use & don't recommend IObit Advanced SystemCare (Ultimate or derivatives)