Where Windows 10 stores default email app in its registry

I have set up Google Chrome as my default email application in my [Windows 10> Settings> System> Default apps] (screenshot). My keyboard has the shortcut Fn+F2 which opens default email application, this works well if for example I use built in “Mail” app or some other app specially designed for this sort of thing but I want to open Gmail in my Chrome browser, problem is when I press the shortcut combination on the keyboard it simply opens Chrome with its homepage.

I need to find out where in Windows registry email default app is stored so I can adjust the link to open with the page I want it to but I can’t find it, there is so many different locations. This is the link I want to use which should work: "C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" -- "https://mail.google.com"

Please let me know where Windows 10 stores its default email app in its registry?

Answer

Ok I've found the answer here if anyone is interested. [enter link description here][1] and it works perfectly

Below is a quote from that link

Here is the reg tweak...for the side one-touch keys (that is what they
are called)

Internet Key:
HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\Appkey\7
"Association"="http" ; Change the string value "http"

Calculator Key:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\AppKey\18
"ShellExecute"="calc.exe"; Change the string value "calc.exe"

Email Key:
HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\Appkey\15
"Association"="mailto" ; Change the string value "mailto"

Cyberlink PowerDVD/Mediasmart Key:
HKLM\SYSTEM\ControlSet001\Control\MobilePc\HotStartButtons\2
"ApplicationPath" = "C:\Program
File(x86)\Cyberlink\PowerDVD9\PowerDVD9.exe"; Change the string value
"C:\Program File(x86)\Cyberlink\PowerDVD9\PowerDVD9.exe"

[1]:
http://h30434.www3.hp.com/t5/Notebook-Hardware-and-Upgrade-Questions/How-do-I-customize-the-Action-Keys/td-p/379207%5CPowerDVD9%5CPowerDVD9.exe%22

But for little more explaining this is what I did:

Run [regedit] and go to
[HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\Appkey\15],
create new [string value] with the name of [ShellExecute] and give it
value of ["C:\Program Files
(x86)\Google\Chrome\Application\chrome.exe" --
"https://mail.google.com"]. [Appkey\7] is for internet shortcut key
and [AppKey\18] is for calculator shortcut key. Besides [ShellExecute]
which executes program you can also do [Association] with example
value of [http] or [mailto], there are possibly more actions that can
be done.