diff --git a/config/initializers/marcel.rb b/config/initializers/marcel.rb
new file mode 100644
index 0000000000..c46ffb59a7
--- /dev/null
+++ b/config/initializers/marcel.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+# config/initializers/marcel.rb
+
+# NOTE: https://github.com/rails/marcel/issues/77
+Marcel::Magic.remove("video/x-ms-wmv") if Marcel::MimeType.for("%PDF-1.6.%wmv2") == "video/x-ms-wmv"