This command associates filename extensions (for services that don't automatically include them) with their mime types.
Use optional first two parameters to choose comparison type. You may use '?' and '*' wildcards for one and several characters
You may also use quotes in mime type definition for example to specify charset. e.g. Russian webmasters often use *.htm extension
for windows-1251 documents and *.html for unix koi8-r documents: "text/html; charset=koi8-r" for *.html and "text/html; charset=windows-1251" for *.htm.
Default unknown type for other extensions: application/unknown *.*