Avast free allowed a virus to be downloaded

Avast Free Antivirus / Premium Security
1

I have a ‘4shared’ account and download various items from them. On the 27th October I downloaded 6 files.

On the 22nd November I received the following from 4shared:

Dear Peter,
McAfee antivirus software detected a virus in a file recently uploaded to your 4shared account.
Infected file can cause severe damage to your computer.
Infected file: “21 Pilots Tiles.apk” was found in folder “My 4shared”.
To minimize the risk it was moved to the Quarantine folder in your account. Please, delete the infected file from your account.
The 4shared Team

I found this file on my pc and scanned it with Avast, which confirmed it contained a virus and I deleted it (stupid, as I cannot remember the virus name).

Why did Avast let me download this file in the first place?

I have tried to ask Avast this via the Support link, but it is a ‘round robin’ that always directs me to here.

Regards, Peter.

2
Infected file can cause severe damage to your computer.

This line is not actually true. APK files are Android install files which means they don’t even do ANYTHING on a Windows computer. Not to mention they don’t even say what it was. It could just as well only be some PUP…

3

So, does Avast not check .apk files when downloaded to a pc? I always download them to my pc first, as I thought this was a safe way of getting these files.