Most often some applications don’t work on servers which have PHP4 with them and the hosting chap simply says, he cant change that.
So the simple solution is to open your .htaccess file and copy paste this code.
AddHandler application/x-httpd-php5 .php .php4 .php3 .php5
AddType x-mapp-php4 .php
That will do the trick.
So if you have any issues like these get in touch with us at : firstname.lastname@example.org