Fixing some missing stuff in VS 2022

[threedslider]

Please review from two fixing for missing stuff in Visual Studio Community 2022 ? :)

So far it compiles very smoothly but after then it doesn't work at launch as app in pvengine64.exe however it runs but nothing to show, I am following this guide from readme but still it doesn't work, I don't know how to make the right path of pvengine64... I suspect the povcmax64 is old so I need to update in current time for DLL.

Regards.