Just as a little goodie, the XFolder class replaces the standard folder icons (both for closed and open folders) with new ones which are derived from OS/2 Warp 4:

Closed folder
Open folder

To remind you that the XFolder class is installed, a tiny gray "X" was put onto the folders.

You can turn this feature off in the XFolder Global Settings. Note that this will require a reboot.

In a future release, I may add the option to freely replace the default folder icons.