diff --git a/source/mijin/util/winerr.hpp b/source/mijin/util/winerr.hpp
new file mode 100644
index 0000000..e4002e2
--- /dev/null
+++ b/source/mijin/util/winerr.hpp
@@ -0,0 +1,69 @@
+
+
+#pragma once
+
+#if !defined(MIJIN_UTIL_WINERR_HPP_INCLUDED)
+#define MIJIN_UTIL_WINERR_HPP_INCLUDED 1
+
+#include <format>
+
+#include <windows.h>
+#include "./winundef.hpp"
+
+#include "./exception.hpp"
+
+namespace mijin
+{
+
+//
+// public types
+//
+
+class HRException : public Exception
+{
+private:
+    HRESULT hResult_;
+public:
+    explicit inline HRException(HRESULT hResult);
+    inline HRException(std::string_view message, HRESULT hResult);
+};
+
+//
+// public functions
+//
+
+[[nodiscard]]
+inline std::string getHResultMessage(HRESULT hResult)
+{
+    if (hResult == S_OK)
+    {
+        return "Success (0x0)";
+    }
+    return std::format("Unknown error (0x{:x}", hResult);
+}
+
+inline HRESULT ensureHR(HRESULT hResult, std::string_view message = {})
+{
+    if (!SUCCEEDED(hResult))
+    {
+        if (message.empty())
+        {
+            throw HRException(hResult);
+        }
+        throw HRException(message, hResult);
+    }
+    return hResult;
+}
+
+HRException::HRException(HRESULT hResult) : Exception(getHResultMessage(hResult)), hResult_(hResult)
+{
+
+}
+
+HRException::HRException(std::string_view message, HRESULT hResult)
+    : Exception(std::format("{} {}", message, getHResultMessage(hResult))), hResult_(hResult)
+{
+
+}
+}
+#endif // !defined(MIJIN_UTIL_WINERR_HPP_INCLUDED)