Import libraries provide the linker with information about functions from a .dll that might be used by a program. If you try to compile some code without a suitable import library, you could have a [Wiki4d:ErrorMessages/LinkerErrors linker error], such as:
{{{
Error 42: Symbol Undefined _GetWindowInfo@8
}}}

Some import libraries are provided with the Digital Mars C++ compiler, but those .lib files have developed a reputation for being out-of-date.

You might be able to use .lib files from another source, such as: [http://downloads.dsource.org/projects/dwt/dwt-win-importlibs.zip dwt-win-importlibs.zip] (for [/projects/dwt dwt-win], [Ng:digitalmars.D.dwt:933 announcement])

Import libraries can be created using [/projects/bindings/wiki/DefFiles .def files].