how to add specific file type to server 

how to enable server for accepting specific how to add specific file type to server file types
AddType is specifying that you are adding a MIME type. The application string is the actual parameter of the MIME you are adding, and the final little
bit is the default extension for the MIME type you just added, in our example this is swf for ShockWave File.

now let’s suppose we want to add swf file type to server , we must write this code in our htaccess file
AddType application/x-shockwave-flash swf
and put there

Easy htaccess tutorials