Instead, DLL files are designed to be called upon by other apps. In fact, they are designed to be called upon by multiple apps at once. The “link” part of the DLL name also suggests another important aspect. Multiple DLLs can be linked together so that when one DLL is called, a number of other DLLs are also called at the same time. A virus, spyware, or other malware program can cause .dll errors. We recommend running a full virus and spyware scan on d3dcompiler_46.dll missing your computer to find and remove any infections.