Gets a list of recommended
GAppInfos for a given content type, i.e.
those applications which claim to support the given content type exactly,
and not by MIME type subclassing.
Note that the first application of the list is the last used one, i.e.
the last one for which
g_app_info_set_as_last_used_for_type() has been called.
The content type to find a
The data is owned by the caller of the function. The value is a NUL terminated UTF-8 string.