Ok, i found the solution even if some notes are not available (like 1056696 
)
On Linux and Windows, certain minimum releases of the C runtime are required to execute the programs. See SAP Notes 1021236 (for Linux) and 684106 (for Windows). The compiler and linker options needed to compile programs using the SAP NetWeaver RFC SDK are listed in SAP Note 1056696.
In addition, for Windows users using Microsoft Visual Studio, this is a description of how to set the Visual Studio project properties:
General section: Make sure the CharacterSet field is set to “Use Unicode Character Set.”
Debugging section: Under Environment, add something like Path=%Path%;nwrfcsdk\lib.
C/C++ section:
General: Add the nwrfcsdk\include directory under Additional Include Directories.
Preprocessor: Add the two preprocessor definitions SAPonNT and SAPwithUNICODE.
Code Generation: Choose “Multi-threaded DLL (/MD)” as the Runtime Library; selecting “Multi-threaded Debug DLL (/MDd)” may lead to strange problems.
Linker section:
General: Add the nwrfcsdk\lib directory under Additional Library Directories.
Input: Under Additional Dependencies, add libsapucum.lib, sapnwrfc.lib, and sapdecfICUlib.lib
The first time i tried on VS2015 i put them, but now i'm working in VS2010 (due other compatibility issues with Siemens Teamcenter 10) and i completly forgot them (and they are not so easy to find!)