It is confusing. The original author was the same as for the .html PAGES but now it’s http://wordpress.org/extend/plugins/problem-with-post-edit-buttontm-on-pages/ at DiscountWebDesigner
Anyway, I’m going in to change the code now and will let you know how it goes.
this is the current code:
<?php
/*
Plugin Name: .htm on PAGES
Plugin URI: http://www.introsites.co.uk/33~html-wordpress-permalink-on-pages-plugin.html
Description: Adds .htm to pages.
Author: IntroSites
Version: 1.1
Author URI: http://www.introsites.co.uk/
*/
add_action(‘init’, ‘htm_page_permalink’, -1);
register_activation_hook(__FILE__, ‘active’);
register_deactivation_hook(__FILE__, ‘deactive’);
after changings I got this warning:
Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, ‘html_page_permalink’ was given in /problem-with-post-edit-buttonome/content/44/7739444/problem-with-post-edit-buttontml/wp-includes/plugin.php on line 403
I changed it back
big problem now – put in your code got error – but back original code another error
Fatal error: Call to undefined function sp_is_forumpage() in /problem-with-post-edit-buttonome/content/44/7739444/problem-with-post-edit-buttontml/wp-content/plugins/problem-with-post-edit-buttontm-on-pages/problem-with-post-edit-buttontm-on-pages.php on line 15
I just uploaded the plugin by ftp and all is back up again. Ideas for what’s next?
Quick update: I changed the code as instructed and got an error message and the plugin was deactivated. I changed the code back to original and plugin was successfully reactivated.
Ah shame, It is obviously too early in the cycle for it to be available.
In am going to have to download and install this plugin and then see how best to interrupt it. so I will do that next
Well – I have looked at things and to be honest I can see no ‘quick and dirty’ answer to this.
The next stage from our point of view is to determine whether we want to rewrite any code to properly support this other plugin.
Afraid not. My next stop is to talk this over with Steve (Mr Papa) but he wont really be available for this until the weekend.
not sure what I am supposed to look at 
3 pages and fairly quick stop by tonight… tomorrow night more available…