This feature is available in Microsoft Phone Link app. I want this feature for KDE Connect.
I finally managed to add this feature through changes in Registry Editor.
I just need you to update KDE Connect installer with the following code:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Classes\tel]
"URL Protocol"=""
@="URL:TEL Protocol"
[HKEY_CURRENT_USER\Software\Classes\sms]
"URL Protocol"=""
@="URL:SMS Protocol"
[HKEY_CURRENT_USER\Software\Classes\KDEConnectURL.tel\DefaultIcon]
@="C:\\Windows\\System32\\imageres.dll,42"
[HKEY_CURRENT_USER\Software\Classes\KDEConnectURL.tel\shell\open\command]
@="\"C:\\Users\\user\\AppData\\Local\\Programs\\KDE Connect\\bin\\kdeconnect-handler.exe\" %1"
[HKEY_CURRENT_USER\Software\Classes\KDEConnectURL.sms\DefaultIcon]
@="C:\\Windows\\System32\\imageres.dll,42"
[HKEY_CURRENT_USER\Software\Classes\KDEConnectURL.sms\shell\open\command]
@="\"C:\\Users\\user\\AppData\\Local\\Programs\\KDE Connect\\bin\\kdeconnect-handler.exe\" %1"
[HKEY_CURRENT_USER\Software\KDEConnect\Capabilities]
"ApplicationDescription"="Transfer data between devices"
"ApplicationIcon"="C:\\Windows\\System32\\imageres.dll,42"
"ApplicationName"="KDE Connect"
[HKEY_CURRENT_USER\Software\KDEConnect\Capabilities\URLAssociations]
"tel"="KDEConnectURL.tel"
"sms"="KDEConnectURL.sms"
[HKEY_CURRENT_USER\Software\RegisteredApplications]
"KDEConnect"="Software\\KDEConnect\\Capabilities"
[HKEY_CURRENT_USER\Software\Classes\Applications\kdeconnect-handler.exe]
"FriendlyAppName"="KDE Connect"
[HKEY_CURRENT_USER\Software\Classes\Applications\kdeconnect-handler.exe\DefaultIcon]
@="C:\\Windows\\System32\\imageres.dll,42"