MIME type tells browser how to handle specific extension. Ex. If you are using the text/html mime type it equates to .htm, .html, and .shtml extensions on most servers, and this tells your browser to interpret all files with those extensions as HTML files.
To add a MIME type :
1. Login to your cpanel.
2. Check for Advanced option
3. Click on “MIME types”
4. Enter the MIME type you wish to add in the first field.
5. Enter the extension you wish to add in the second filed.
6. Click on the “Add” button.