Thread:Project:Support desk/Opening .msg file in MediaWiki works in Firefox, but not Internet Explorer 11./reply

First: I don't have a solution currently, but two notes:

I know that you can change how different file types are delivered by adding according lines to your .htaccess file. I guess that would be the place to modify. Note that the syntax of .htaccess files is rather strict. If there only is one syntax error in them, the server will only respond with an error 500. Maybe .htaccess files are deactivated in your setup?

If .htaccess files are working for you, I guess you need the Apache module mod_mime ( http://httpd.apache.org/docs/2.2/mod/mod_mime.html ) in order to use an AddHandler directive.