Bypassing Antivirus software with false-positives

Hey guys, I like some of you have problems with my antivirus calling something a virus when really it's a false positive, such as something packed with themida. The following are popular anti virus software bypasses.

Antivir:

1. Open your configuration.
2. Find "guard" and then "scan", and find "Exceptions."
3. Find the file that you know is a false positive by going through your computer and add it to the list.

Nod 32

1. Open your Nod 32 setup and go into "advanced setup"
2. Expand "HTTP, HTTPS" and click "Address Management."
3. Add mpgh.net* this will let you download the files from the site.
4. After you've downloaded the file, go to "exclusions" and set it to where you extracted it. I extract to FInject so whatever I download and extract to this folder will be safe.

Have an AntiVirus that has problems with false-positives? Request it to be added here!

Already knew this but nice tutorial anyways

How do we know if its a virus or a false positive though?
Just curious