This usually is Earthlink hosting. To work around this problem upload the attached htaccess file to your webedit directory which will map .php files to the same binary as the .php4 files and make them work. After you upload the file you will have to rename it from earthlink.htaccess to .htaccess (make sure the first letter is a .).
It also adds index.php to the list of files to look for when you go to a directory so you can type in http://www.example.com/webedit instead of http://www.example.com/webedit/index.php which is a little nicer.
The actual code in the attachment is pretty simple and is just
# Map .php extension to the php5 cgi
AddHandler php-script .php
Action php-script /root-cgi/php4
# Add index.php to the list of default files
DirectoryIndex index.html index.htm index.php

The article has been updated successfully.