Unmanaged class libraries compile to a static link library (a .LIB file).
Both managed and unmanaged C++ applications can use .LIB files after changing linker settings to add an additional dependency.
You might need to instruct the linker in the calling project to ignore the single-threaded C runtime library that is brought in with your library.
Calling unmanaged C++ code from Visual Basic .NET or C# is more difficult than from managed C++.
