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

avs/game.h

@@ -0,0 +1,44 @@
+#pragma once
+
+#include <initializer_list>
+#include <string>
+
+#include <windows.h>
+
+namespace avs {
+
+    /*
+     * helpers
+     */
+    namespace game {
+
+        // properties
+        extern char MODEL[4];
+        extern char DEST[2];
+        extern char SPEC[2];
+        extern char REV[2];
+        extern char EXT[11];
+
+        // handle
+        extern HINSTANCE DLL_INSTANCE;
+        extern std::string DLL_NAME;
+
+        // helpers
+        bool is_model(const char *model);
+        bool is_model(const char *model, const char *ext);
+        bool is_model(const std::initializer_list<const char *> model_list);
+        bool is_ext(const char *ext);
+        bool is_ext(int datecode_min, int datecode_max);
+        std::string get_identifier();
+
+        // functions
+        void load_dll();
+
+        /*
+         * library functions
+         */
+
+        bool entry_init(char *sid_code, void *app_param);
+        void entry_main();
+    }
+}