Multipurpose Internet Mail Extensions (MIME) is a standard that indicates the format of a file.
Default Microsoft IIS server security policies prevent the download of files that do not match the specified types. Add or update the following file extensions to the MIME type list on the Microsoft IIS server:
Extension: .* | MIME type application/octet-stream |
Extension: .dat | MIME type application/octet-stream |
Extension: .dlpenc | MIME type application/octet-stream |
For information about how to enable Microsoft IIS server to recognize the needed MIME types, see KB96817.