#include <windows.h>

LRESULT CALLBACK WndProc(HWND wnd, UINT msg, WPARAM w, LPARAM l) {
	switch(msg) {
	case WM_CREATE:
		{
		char fileBuf[MAX_PATH];
		fileBuf[0] = '\0';

		OPENFILENAMEA ofn;
		ZeroMemory(&ofn, sizeof(OPENFILENAMEA));
		ofn.lStructSize = sizeof(OPENFILENAMEA);
		ofn.hwndOwner = wnd;
		ofn.hInstance = GetModuleHandle(NULL);
		ofn.lpstrFilter = "*.*";
		ofn.lpstrFile = fileBuf;
		ofn.nMaxFile = MAX_PATH;

		GetOpenFileNameA(&ofn);
		}
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProcA(wnd, msg, w, l);
	}

	return 0;
}

int WINAPI WinMain(HINSTANCE inst, HINSTANCE, LPSTR, int) {
	WNDCLASSA wc;
	ZeroMemory(&wc, sizeof(WNDCLASS));
	wc.hInstance = inst;
	wc.lpfnWndProc = &WndProc;
	wc.lpszClassName = "TheClass";
	RegisterClassA(&wc);

	HWND wnd = CreateWindowExA(WS_EX_OVERLAPPEDWINDOW, "TheClass", "Test",
		WS_OVERLAPPEDWINDOW, -1, -1, -1, -1, NULL, NULL, inst, NULL);

	ShowWindow(wnd, SW_SHOW);

	MSG msg;
	while(GetMessageA(&msg, NULL, 0, 0)) {
		TranslateMessage(&msg);
		DispatchMessageA(&msg);
	}

	return msg.wParam;
}