How to include custom non-system folder under This PC in Windows 8.1?

Solution 1:

Take a look at the tools FolderTweak for Win8.1

or This PC Tweaker

Both tools can add new items. Maybe they help you.

Solution 2:

You can also add folders by right clicking and selecting "Add Network Location." You can use a network path like \\computername\users\me\whatever to point to a folder on your local machine.

Then

Solution 3:

I recently figured out how to do this manually and have added the answer to this question: https://superuser.com/a/914701/422795 - "How can I create a new system folder to show up in “This PC” in Windows 8.1 without additional tools?".

It is not for the faint hearted though as it involves a lot of registry editing. However, if you're in a situation where you cannot download a 3rd party app (e.g. at work) and desperately want to add your own custom folder, it might be of help.