One of the major frustrations of PC gamers is the infamous "[certain.dll] file is missing" type of errors. Often when install Mortal Shell and try to play it, you will encounter this d3dcompiler_43.dll file missing error. In this post, we will learn how to diagnose d3dcompiler_43.dll related error in Mortal Shell. Once we have diagnosed d3dcompiler_43.dll error in Mortal Shell, we will look at various ways to fix it.