proper content type, or you want to alter the defaults, you can change this using .htaccess file.
For example if you need to configure your server to display ASX files:
AddType video/x-ms-asf asf asxFor windows media audio WMA
AddType audio/x-ms-wma .wmaA comprehensive list of mime-types can be found here
There is one more useful feature of the AddType directive. Most of you most probably know
that Internet Explorer opens MS Word, Excell, PDF and some other files inside a browser
window. To force the browser to download the file you can use AddType to change the
AddType application/octet-stream .doc .xls .pdf