If you want to adjust or edit the MIME types set up on the server, this can be done by correcting your web.config file, or by connecting with IIS Manager and via the right one in the web.config file.
In the web.config file, the mimeMap element is used: http://www.iis.net/ConfigReference/system.webServer/staticContent/mimeMap
Article from the support category: ASP & ASP.NET