A Windows Explorer on RedHat 7.3!??
 

is there some kind of explorer
just like windows explorer!??

laterz...

have you tried searching for info? there aer many explorer clones, nautilus, kfm, gmc, normally best to use one specifically for the desktop environment you are using, and i presume that means you're using KDE, as you're labelling the entire thing as just redhat... there are tons around though, just keep looking. there are other non kde/gnome specific ones such as gentoo (not the distro) and many many others

If you're using GNOME (most likely), then nautilus.
If you're using KDE (quite likely), then konqueror.