gContentTypeEquals(type1, type2)
gContentTypeIsA(type, supertype)
gContentTypeIsUnknown(type)
gContentTypeGetDescription(type)
gContentTypeGetMimeType(type)
gContentTypeGetIcon(type)
gContentTypeCanBeExecutable(type)
gContentTypeFromMimeType(mime.type)
gContentTypeGuess(filename, data)
gContentTypeGuessForTree(root)
gContentTypesGetRegistered()