If you're running Windows 10, simply check-in the following entry under the "Win 10" tab when editing a block list:
Solitaire.exe
If you're running Windows 7, all you have to do is add this file to the "Apps" tab while editing a block list:
C:\Program Files\Microsoft Games\Solitaire\Solitaire.exe
If you're using XP or older, add this file:
C:\Windows\System32\sol.exe