Are you presently multibooting or planning to in the future? If so, do you use a Windows 10 (NT6) boot menu to select from other operating systems which incude

Are you presently multibooting or planning to in the future? If so, do you use a Windows 10 (NT6) boot menu to select from other operating systems which incude Windows XP (or presumably other versions of NT5)? Then the defective Microsoft engineering described, applies to your use of XP after it is booted from the W10 menu. Looks like it may also apply to other Windows versions or operating systems like some Linux distributions, so beware. This bug was reported by user Brindusa Tot during operation of Mozilla Firefox. 2015-11-16 Confirmed with difficulty by engineer Yuhong Bao as a defect in the Windows 10 BOOTMGR routine. 2017-01-27 yuhong is on this thread, this is the kind of engineer I would want on my team. Further testing needs to be done to determine if there is an alternative BOOTMGR or procedure which does not suffer from this insidious failure. Mozilla is not a source of this defect at all. It's simply the Microsoft Windows 10 code that's failing to properly do what it says it does.