Hi,
Welcome to Microsoft Q&A!
There is no win32 API related to BLE.
As Darran Rowe said:
The majority of the Bluetooth API is marked in the metadata as DualApiPartition. This comes from the Windows 8 timeframe, prior to the creation of the UWP, to indicate that a certain WinRT API is usable from desktop applications. This means that the UWP API was always intended to be used as a desktop application.
If you want to use BLE, you need to use the UWP API.
Thank you
Jeanine