Index: lld/COFF/Driver.cpp
===================================================================
--- lld/COFF/Driver.cpp
+++ lld/COFF/Driver.cpp
@@ -132,7 +132,6 @@
   case file_magic::windows_resource:
     Resources.push_back(MBRef);
     break;
-
   case file_magic::archive:
     if (WholeArchive) {
       std::unique_ptr<Archive> File =
@@ -145,18 +144,19 @@
     }
     Symtab->addFile(make<ArchiveFile>(MBRef));
     break;
-
   case file_magic::bitcode:
     Symtab->addFile(make<BitcodeFile>(MBRef));
     break;
-
+  case file_magic::coff_object:
+  case file_magic::coff_import_library:
+    Symtab->addFile(make<ObjFile>(MBRef));
+    break;
   case file_magic::coff_cl_gl_object:
     error(MBRef.getBufferIdentifier() + ": is not a native COFF file. "
           "Recompile without /GL");
     break;
-
   default:
-    Symtab->addFile(make<ObjFile>(MBRef));
+    error(MBRef.getBufferIdentifier() + ": unknown file type");
     break;
   }
 }
Index: lld/test/COFF/driver.test
===================================================================
--- lld/test/COFF/driver.test
+++ lld/test/COFF/driver.test
@@ -4,3 +4,8 @@
 
 # RUN: lld-link --version | FileCheck -check-prefix=VERSION %s
 VERSION: {{LLD [0-9]+\.[0-9]+}}
+
+# RUN: yaml2obj < %p/Inputs/export.yaml > %t.obj
+# RUN: lld-link /out:%t.dll /dll %t.obj
+# RUN: not lld-link /out:%t.exe %t.dll 2>&1 | FileCheck -check-prefix=BADFILE %s
+BADFILE: unknown file type