This is what "System Information" tells me: OS Name    Microsoft Windows 10 Home Version    10.0.14393 Build 14393 Here are all the unshifted keys that got passed through: s-y is undefined s-n is undefined s-[ is undefined s-] is undefined s-. is undefined s-` is undefined s-- is undefined s-; is undefined s-' is undefined s-\ is undefined All the other unshifted keys were blocked. Levis >>> Yes, in my case version 24.5 works like yours.  My system informationOS: Microsoft Windows 10 Pro NVersion: 10.0.10586 Build: 10586 My problem is in the version 25.1 release where the super key don't work at all, I check all combinations and none of them work.s-a, s-b, s-c, ..., s-z, s->, s-< etc  Please notice that these combinations work:C-s-a is undefinedC-s-b is undefinedC-s-c is undefinedetc All of the work! On Wednesday, September 21, 2016 7:18 PM, Mambo Levis wrote: Let me understand what exactly is the nature of the problem: is it true that only _some_ hyper- and super- key combinations don't work? Or do none of them work in Emacs 25.1? Levis >> None of them work in Emacs 25.1 official release. For example, key combinations starting with super don't work, but if I make a combinationsuch C-super-a (C-s-a) works. It seams that super and hyper can't be triggered as prefix. On Wednesday, September 21, 2016 7:03 PM, Eli Zaretskii wrote: > Date: Wed, 21 Sep 2016 16:42:14 +0000 (UTC) > From: Mambo Levis > Cc: "robert-emacs@cochranmail.com" , >     "24453@debbugs.gnu.org" <24453@debbugs.gnu.org> > > Eli >>With what customizations did you try that? Yours or those suggested > by Robert? > Levis >>> Robert's and my configurations are the same, it is not a problem of configuration. I made the > following > tests without using Roberts configuration (lets consider the following key sequence s-a) > 1. In emacs 24.5 official release it works. > 2. In emacs master branch it also works > > 3. In emacs-25 branch it doesn't work > 4. In any emacs-25 pretest binaries it doesn't work > 5. In emacs 25.1 oficial release it doesn't work (currently release) > > So, it is clear that the configuration is not the problem. > Any idea or suggestion? No suggestions.  If setting w32-use-fallback-wm-chars-method to a non-nil value doesn't help, I don't know how this is possible, since there's no other difference between Emacs 24.5 and 25.1 I know about regarding keyboard support. Let me understand what exactly is the nature of the problem: is it true that only _some_ hyper- and super- key combinations don't work? Or do none of them work in Emacs 25.1?