Here's how I do my grouping. I have a place where I have folders that I use for groups. I place the icons I want in the group into the folder.
Then I add it to the task bar by right clicking on...

I noticed there's no answer to this yet.

For a folder to show customization changes, it must be marked as read-only. Explorer doesn't let you change the folders read-only attribute, it only...

This is not a standard icon (sort of).

It is used as an overlay of the program's icon when the program has admin rights.
If you can find out where this icon is, and can edit it, just change all...