I running into issues remapping Ctrl+{Punctuation} as well as Alt+{AnyKey} in VIM while using conemu as my terminal. I'm also running Windows 10. To be honest, I'm not sure if this a Windows VIM issue or just a ConEmu VIM issue.
Let me know if you need any further information.
So, after doing some extra research I found some answers.
Essentially, VIM will not recognize certain Ctrl+{Keys}. Here is some reasoning as to why: http://vimhelp.appspot.com/vim_faq.txt.html#faq-20.5. More info here: Is there a way to map Ctrl period and Ctrl comma in Vim?
Also, my Windows terminal appears to be sending the Esc+{Key} when I press Alt+{Key}. I found a workaround here: Alt key shortcuts not working on gnome terminal with Vim