I want to use the APIs like RegCloseKey inside an UWP application.
Can we use these APIs in modern apps? or these APIs are just for win32 apps?
Thanks.
You can read registry values from a Win32 runFullTrust background process launched from a UWP application, and you can write values in the HKEY_LOCAL_MACHINE hive from an "elevated" Win32 application launched from that runFullTrust process.
These techniques are powerful and using them in a UWP app deployed from the Windows Store requires special scrutiny and permission from Microsoft. The techniques are used by OEMs, but not exclusively restricted to them. If you have a good reason and are able to explain it, you're likely to get approval.