VERIFIED SOLUTION i
Product Feature: GUI
The File Open dialog header shows "*.csv* rather than "Open". This is a bug in MapInfo pro 64 bit logged as MIPRO-71920
This is happening as soon as Discover is installed (Bundle Installation) and is logged as MapInfo bug # MIPRO-71920
ResolutionUPDATED: April 13, 2017
The bug is already fixed in the MapInfo Pro 15.2.2 patch. There is no harm to install this patch on an existing Discover bundle 2015.2 installation to fix the issue.