Windows Live Gallery allows me to add Captions and Descriptive tags to all types of photo file that it recognises (eg .jpg and .rw2), and all filters etc work on all of these. When I look at the properties of a .jpg I see that the caption is shown under both Title and Subject, and the descriptive tag under Tags.  However for a RW2, properties show Title, Subject and Tags as blank even though they show normally when viewing the tag/caption panel in Live Gallery itself.  So where are they in the record?

If I import pictures that have been captioned/tagged in WLG into Lightroom for example, it sees the tags & captions on the JPEGs but not on the RW2s so clearly they are stored in different places in the file.  Is there any way to get these items recorded on RW2s the same as JPEGs?