As I documented here:
http://forum.cmsmadesimple.org/viewtopic.php?f=4&t=66501
Here is the configuration to get Pretty URLs working with Abyss Web Server X2 v2.8 and CMSMS 1.11.6
In the CONFIG.PHP put the following:
$config['url_rewriting'] = 'mod_rewrite';
$config['page_extension'] = '.html';
Then under the Host -> Edit -> URL Rewriting area in Abyss setup a rule:
Enabled Rule: Checked
Type: Global
Virtual Path Regular Expression: ^/(.*)$
Case Sensitive: Unchecked
Conditions:
REQUEST_FILENAME - Is not a file
REQUEST_FILENAME - Is not a directory
Apply to subrequests too: Checked
If this rule matches: Perform an internal redirection
Redirecto to: /index.php?page=$
Append Query String: Checked
Escape Redirection Location: Checked
Next Action: Stop matching
