Yep, they are necessary. Those files tell the sim how to associate the scenery BGL files with the textures they work with. If you delete them, the next time you start your sim...they will be regenerated.
One thing I do to make a little room is get rid of the jpg's and bmp's that come with some plane models and scenery files....the rule of thumb I use is anything over 500kb or 1Mb gets trashed.
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