diff --git a/core/os/file_access.cpp b/core/os/file_access.cpp
index 368b4ad09de..033b4b12b9e 100644
--- a/core/os/file_access.cpp
+++ b/core/os/file_access.cpp
@@ -479,6 +479,9 @@ void FileAccess::store_double(double p_dest) {
 
 uint64_t FileAccess::get_modified_time(const String &p_file) {
 
+	if (PackedData::get_singleton() && !PackedData::get_singleton()->is_disabled() && PackedData::get_singleton()->has_path(p_file))
+		return 0;
+
 	FileAccess *fa = create_for_path(p_file);
 	ERR_FAIL_COND_V(!fa, 0);
 
diff --git a/modules/mono/mono_gd/gd_mono_assembly.cpp b/modules/mono/mono_gd/gd_mono_assembly.cpp
index ba56ed6ed5f..ef39b8549db 100644
--- a/modules/mono/mono_gd/gd_mono_assembly.cpp
+++ b/modules/mono/mono_gd/gd_mono_assembly.cpp
@@ -116,6 +116,37 @@ MonoAssembly *GDMonoAssembly::_preload_hook(MonoAssemblyName *aname, char **asse
 		}
 	}
 
+	String name = mono_assembly_name_get_name(aname);
+	bool has_extension = name.ends_with(".dll");
+
+	if (has_extension ? name == "mscorlib.dll" : name == "mscorlib") {
+		GDMonoAssembly **stored_assembly = GDMono::get_singleton()->get_loaded_assembly(has_extension ? name.get_basename() : name);
+		if (stored_assembly) return (*stored_assembly)->get_assembly();
+
+		String path;
+		MonoAssembly *res = NULL;
+
+		for (int i = 0; i < search_dirs.size(); i++) {
+			const String &search_dir = search_dirs[i];
+
+			if (has_extension) {
+				path = search_dir.plus_file(name);
+				if (FileAccess::exists(path)) {
+					res = _load_assembly_from(name.get_basename(), path);
+					break;
+				}
+			} else {
+				path = search_dir.plus_file(name + ".dll");
+				if (FileAccess::exists(path)) {
+					res = _load_assembly_from(name, path);
+					break;
+				}
+			}
+		}
+
+		if (res) return res;
+	}
+
 	return NULL;
 }