Where can we complain

Hi Everybody,
--  ONCE AGAIN.   ---  Missing thumbnails have been a chronic problem for some of us for the last ten years.  It's still going on after ten years despite X7.4 and a promise to convene the staff to look into it.
--   I could not see CPT, CDR, or CMX  thumbnails in Windows Explorer after installing X7.4.   Mystic Thumbs cured the CDR thumbnails  problem.  I cured the CPT and CMX problem by sending X7 to the garbage can and reinstalling X6.
--    Mystic Thumbs makes thumbnails for over one hundred file types.  That includes Corel's PaintShopPro's  "pspimage" files.  They have said that they can do the same for CPT files.  They only require information on the CPT file structure from Corel.
--  Gerard has refused point blank to send information to Mystic Thumbs about Corel 's CDGS file structures.  The reason, "It's proprietary."   Yet everyone else  in the universe publishes information on their file structures.  That includes Corel's PaintShopPro's "pspimage"  image format.
--  Gerard has been completely irrational about this problem for the last ten years.  Would you  know who to complain to at Corel in order to get past Gerard. 
Phil