I have the requirements the component's home page stated it needs: PHP 5, Firefox 22.214.171.124 with scripts enabled for the site.
eXtplorer_2.0.0_RC1 claims to have installed successfully on Joomla 1.0x but when I try to run it, I see an error message about a missing component: ExtJS Library could not be found.
The message test tells me to check the fetchscript.PHP file permissions and that file is not in the directory either.
Thinking I had a bad download, I downloaded the file again, and got the same results. It's dead out of the box.