Probably need to change the icon here: %localappdata%\inkdrop\app.ico.
Or just replace DisplayIcon with the path to the exe file.
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\inkdrop]
"DisplayIcon"="%localappdata%\\inkdrop\\Inkdrop.exe"
"DisplayName"="Inkdrop"