Hi Onktebong
... Is there really no file explorer pre-installed? ...
Of course not. The point of the ISOs is not to provide a system
that's ready to go and fulfill you needs. It's to get you to a GUI
(or command line) so you can then install the packages
that interest you. You don't need a file explorer for that.
The TC16 x86 CorePlus ISO is almost 290 Mbytes. Over 200 Mbytes
of that is firmware, drivers, and utilities for wireless support. Plus
there are 7 window managers included.
The point is, the ISOs don't get bloated with items not need to get
up and running.