Hololens dll not found exception

I have a windows dll that I can load without problem in a unity UWP app (laptop and surface pro4).
When I try to load this dll in a hololens application, I have a DllNotFound exception.
After investigating, I have found several issues :
- the dll has a dependency to msvc runtime (msvc140P.dll, VCRuntme140 and so on)
- the dll has a dependency to advapi32.dll and WINMM.dll

I think the source of the dll can be modified in order to remove dependencies to advapi and WINMM.
However, for the visual runtime libraries, I think they are not present on hololens by default. So the question is can I add these libraries directly in the app package? Has anybody already had similar issue?

 

For other person that might have this issue : After adding the three dependencies (msvc140P.dll, VCRuntime140 and concrt140.dll) in the unity Plugins folder, loading and P/Invoke of the dll is ok now.