[PLUG] http://localhost still mis-configured

[Rich Shepard]

   I've not found the appropriate Google search term for this situation and I
hope one of you can point me to the appropriate doc so I can learn how to
fix the problem.

   When I point firefox to http://localhost/drupal-sqlite/install.php,
http://localhost/elxis/install.php, or http://localhost/phpinfo.php I see
the file contents rather than having it run. When I point the browser to
http://localhost/appl-ecosys/index.shtml the home page of my web site
displays.

   I can invoke php interactively from the command line. What might be
missing or mis-configured to cause this result?

TIA,

Rich