Use Multi-Byte Character Set

I recently got this error

error C2664: 'InternetOpenW' : cannot convert parameter 1 from 'const char [10]' to 'LPCWSTR'

when I was trying to compile/build my source code including web.cpp and web.h. Later comparing my old setting with the new ones I realized that I solved it using the project properties.

Right Clik on Project name > Properties > Configuration Properties > Character Set should be chosen as "Use Multi-Byte Character Set"