#define WIN32_LEAN_AND_MEAN //tells the compiler not to include MFC overhead

#include <Windows.h>
#include <Winuser.h>

#ifndef WS_EX_LAYERED
#define WS_EX_LAYERED 0x00080000
#endif
#ifndef LWA_COLORKEY
#define LWA_COLORKEY 1
#endif
#ifndef LWA_ALPHA
#define LWA_ALPHA 2
#endif
#define COLOR_TRANSPARENT    RGB(128,128,128)

int SetWindowTransparent_l(HWND hwnd, int iAlpha)
{
  typedef DWORD (WINAPI *PSLWA)(HWND, DWORD, BYTE, DWORD);
  PSLWA            pSetLayeredWindowAttributes;
  HMODULE        hDLL;
  SetWindowLong (hwnd , GWL_EXSTYLE , GetWindowLong (hwnd , GWL_EXSTYLE ) | WS_EX_LAYERED ) ;
  hDLL = LoadLibrary ("user32.dll");
  if(!hDLL)
    MessageBox(NULL,TEXT("No Handle"),TEXT("ERROR"),MB_OK);
  pSetLayeredWindowAttributes = (PSLWA) GetProcAddress(hDLL,"SetLayeredWindowAttributes");
  if (pSetLayeredWindowAttributes != NULL)
  {
    pSetLayeredWindowAttributes (hwnd,COLOR_TRANSPARENT, iAlpha, LWA_COLORKEY|LWA_ALPHA);
  }
  return (0);
}

void bmpshow(HWND hwnd,HBITMAP hbitmap,int xp,int yp,int xs,int ys,int xe,int ye){
			HDC hdc = GetDC(hwnd); 
			HDC image_dc = CreateCompatibleDC(hdc);	
			SelectObject(image_dc,hbitmap);
			BitBlt(hdc,xp,yp,xe,ye,image_dc,xs,ys,SRCCOPY); 
			ReleaseDC(hwnd, hdc); 
			DeleteDC(image_dc);
}

HBITMAP Table   = (HBITMAP)LoadImage(GetModuleHandle(NULL),"tbl\\tbl_Window.bmp" ,IMAGE_BITMAP,0,0,LR_LOADFROMFILE);
HBITMAP SysBtns = (HBITMAP)LoadImage(GetModuleHandle(NULL),"tbl\\tbl_SysBtns.bmp",IMAGE_BITMAP,0,0,LR_LOADFROMFILE);

void table(HWND hwnd,int x1,int y1,int x2,int y2){
			x2=x1+x2;
			y2=y1+y2;
			bmpshow(hwnd,Table,x1   ,y1		,   0,   0,24      ,24 );
			bmpshow(hwnd,Table,x1+24,y1		,  24,   0,x2-x1-48,24 );
			bmpshow(hwnd,Table,x2-24,y1		,2072,   0,24      ,24 );

			bmpshow(hwnd,Table,x1   ,y1+24	,   0,  24,2       ,y2-y1-26);
			bmpshow(hwnd,Table,x1+2 ,y1+24	,  24,  24,x2-x1-4 ,y2-y1-26);
			bmpshow(hwnd,Table,x2-2 ,y1+24	,2072,  24,2       ,y2-y1-26);

			bmpshow(hwnd,Table,x1   ,y2-2	,   0,1304,2       ,2  );
			bmpshow(hwnd,Table,x1+2 ,y2-2	,  24,1304,x2-x1-4 ,2  );
			bmpshow(hwnd,Table,x2-2 ,y2-2	,2072,1304,2       ,2  );
}

void ShowSysBtn(HWND hwnd)
{
bmpshow(hwnd,SysBtns,570,2,0, 0,20,20);
bmpshow(hwnd,SysBtns,595,2,0,20,20,20);
}

void CheckSysBtn(HWND hwnd,POINT MousePos,int Item)
{
int x=MousePos.x;
int y=MousePos.y;
	if(x>570 && x<590 && y>2 && y<22){
		bmpshow(hwnd,SysBtns,570,2,Item*20, 0,20,20);
		if(Item==2){ShowWindow(hwnd,SW_MINIMIZE);}
	}
	else
	{
		bmpshow(hwnd,SysBtns,570,2, 0, 0,20,20);
	}
	if(x>595 && x<615 && y>2 && y<22){
		bmpshow(hwnd,SysBtns,595,2,Item*20,20,20,20);
		if(Item==2){SendMessage(hwnd, WM_DESTROY, 0, 0);}
	}
	else
	{
		bmpshow(hwnd,SysBtns,595,2, 0,20,20,20);
	}
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
	POINT MousePos;

	if(msg==WM_CREATE)
		{
		SetWindowTransparent_l(hwnd,255);
		table(hwnd,0 ,0  ,640,480);
		ShowSysBtn(hwnd);
		}
	if(msg==WM_LBUTTONUP)
		{
		MousePos.x = LOWORD(lparam);
        MousePos.y = HIWORD(lparam);
		CheckSysBtn(hwnd,MousePos,0);
		}
	if(msg==WM_MOUSEMOVE)
		{
		MousePos.x = LOWORD(lparam);
        MousePos.y = HIWORD(lparam);
		CheckSysBtn(hwnd,MousePos,1);
		}
	if(msg==WM_LBUTTONDOWN)
		{    
		MousePos.x = LOWORD(lparam);
        MousePos.y = HIWORD(lparam);
		CheckSysBtn(hwnd,MousePos,2);
			if(MousePos.x<550 && MousePos.y<24){
			ReleaseCapture();
			SendMessage(hwnd, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);          
			UpdateWindow(hwnd);
			}
		}
	if(msg==WM_PAINT)
		{
		table(hwnd,0 ,0  ,640,480);
		ShowSysBtn(hwnd);
		}

	if(msg==WM_DESTROY)
		{
			PostQuitMessage(0);
			return 0;
		}
	return(DefWindowProc(hwnd, msg, wparam, lparam));
}

int WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hprevinstance, LPSTR lpcmdline, int ncmdshow)
{

	WNDCLASSEX window; //blank window, we're using the extended windows class (WNDCLASSEX)
	HWND hwnd; //window handle
	MSG msg; //message

	window.cbClsExtra = 0; //extra class stuff, set to 0 for now
	window.cbSize = sizeof(WNDCLASSEX); //set to the size of the WINDOWCLASSEX structure
	window.cbWndExtra = 0; //extra class stuff, set to 0 for now
	window.hbrBackground = (HBRUSH)GetStockObject(GRAY_BRUSH);//BLACK_BRUSH); //sets the color of the brush to paint in, notice the type cast to HBRUSH, this is because GetStockObject() can be used for more tehn just getting the brushcolor
	window.hCursor = LoadCursor(NULL, IDC_ARROW); //cursor for your app, sets it to the standard arrow
	window.hIcon = LoadIcon(NULL, IDI_APPLICATION); //icon of your program
	window.hIconSm = LoadIcon(NULL, IDI_APPLICATION); //icon that appears on the titlebar and when minimized
	window.hInstance = hinstance; //the application instance
	window.lpfnWndProc = WindowProc; //name of the function that takes care of the messages
	window.lpszClassName = "WINCLASS1"; //name of the class
	window.lpszMenuName = NULL; //menu, dont worry about this now (maybe in a later example, just set it to NULL
	window.style = CS_DBLCLKS | CS_OWNDC | CS_HREDRAW | CS_VREDRAW;

	if(!RegisterClassEx(&window))
		return 0;

	if(!(hwnd = CreateWindowEx(
		NULL,//WS_EX_TRANSPARENT, //extended style
		"WINCLASS1", //name of the class
		"... by K4!53R", //title of the window
		WS_OVERLAPPED | WS_VISIBLE | WS_POPUP, //common flags, you DO want to see your window, right?
		0, 0, //initial x and y postion
		650, 515, //initial height and width
		NULL, //handle to parent, set to NULL so the desktop is the parent
		NULL, //handle to menu, we didnt use a menu now so dont worry about it
		hinstance, //instance of application
		NULL ))) //extra param
	return 0;

	while(true)
	{
		if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
		{
			if(msg.message == WM_QUIT)
				break;
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}
	return(msg.wParam);
}

#define WIN32_LEAN_AND_MEAN

#include <Windows.h>
#include <Winuser.h>

LRESULT CALLBACK WindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
	if(msg==WM_DESTROY)
		{
			PostQuitMessage(0);
			return 0;
		}
	return(DefWindowProc(hwnd, msg, wparam, lparam));
}

int WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hprevinstance, LPSTR lpcmdline, int ncmdshow)
{
	WNDCLASSEX window; 
	HWND hwnd; 
	MSG msg;

	window.cbClsExtra = 0; 
	window.cbSize = sizeof(WNDCLASSEX); 
	window.cbWndExtra = 0; 
	window.hbrBackground = (HBRUSH)GetStockObject(GRAY_BRUSH);
	window.hCursor = LoadCursor(NULL, IDC_ARROW);
	window.hIcon = LoadIcon(NULL, IDI_APPLICATION); 
	window.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
	window.hInstance = hinstance;
	window.lpfnWndProc = WindowProc;
	window.lpszClassName = "WINCLASS1";
	window.lpszMenuName = NULL; 
	window.style = CS_DBLCLKS | CS_OWNDC | CS_HREDRAW | CS_VREDRAW;

	if(!RegisterClassEx(&window))
		return 0;

	if(!(hwnd = CreateWindowEx(
		NULL,//WS_EX_TRANSPARENT, 
		"WINCLASS1",
		"... by K4!53R",
		WS_OVERLAPPED | WS_VISIBLE | WS_POPUP, 
		0, 0,
		650, 515, 
		NULL, 
		NULL,
		hinstance, 
		NULL )))
	return 0;

	while(true)
	{
		if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
		{
			if(msg.message == WM_QUIT)
				break;
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}
	return(msg.wParam);
}

sicher kenn ich switch, musste ich zwischendurch aber umändern weil ich es etwas anders brauchte, aber trotzdem danke für den tip!