SOLVED Windows 10 Share pane - unhide the Mail app

[colormar]

Accidentally I hide the Mail app in the Windows 10 Share pane (The panel displayed to the right when I pressed the Share button). How can I unhide the Mail app?
I used the Share by mail frequently. Please, I need your help to solve this problem. Thank you.

 

[colormar]

I receive this answer in the Microsoft Community - Ask a Question, and it work for me, At last I have mail in the share list;

B-Hörnchen und A-Hörnchen replied on August 20, 2015
MVP Community Moderator Wiki Author MCC: Content Creator
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I don't know of a GUI way to do this.
Go to this registry key
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\AppContract\Windows.ShareTarget
There should be one for Microsoft.Mail_whatever ... It controls the states you can choose (pin or hide). If not present it's in the initial state. Delete this key.