Let us start here, from square one. No, from Zero!

games/ddr/p3io/usbmem.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "hooks/devicehook.h"
+
+namespace games::ddr {
+
+    class DDRUSBMEMHandle : public CustomHandle {
+    private:
+        char response_data[256]{};
+        size_t response_data_size = 0;
+
+        void respond(const char *data);
+
+    public:
+        bool open(LPCWSTR lpFileName) override;
+
+        int read(LPVOID lpBuffer, DWORD nNumberOfBytesToRead) override;
+
+        int write(LPCVOID lpBuffer, DWORD nNumberOfBytesToWrite) override;
+
+        int device_io(DWORD dwIoControlCode, LPVOID lpInBuffer, DWORD nInBufferSize, LPVOID lpOutBuffer,
+                      DWORD nOutBufferSize) override;
+
+        bool close() override;
+    };
+}