What is a MIME type?
MIME is an abbreviation for Multi-purpose Internet Mail Extensions, which is a standard way of classifying file types on the Internet. Programs such as Web servers and browsers all have a list of MIME types. This supports the transfer of files of the same type in the same way, regardless of the operating system. A MIME type has two parts, a type and a subtype, which are separated by a slash (/). If a KML or KMZ file that has been created in Google Earth is having a problem, make sure that the proper MIME type is set for that file. More details about XML Media Types is available in RFC 3023: http://tools.ietf.org/html/rfc3023. The Internet Assigned Numbers Authority (IANA) maintains a registry of official media types. More information about the different types is available at: http://www.iana.org/assignments/media-types/.