[cobalt-users] raq550 .htaccess & custom 404 page

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I need to use an htaccess file to set a custom 404 and to set php to parse 
.htm files: 

AddType application/x-httpd-php .htm
ErrorDocument 404 http://www.domain.com/404.htm 

This works on our raq4, but throws an error 500 on the raq550. 

Anyone come across this one? The fixes for the auth problems with htaccess 
files on a raq550 that have been posted to this list don't seem to help this 
problem.