Weird Dev C++ inconsistancy with Run and the Exe itself

When I run my program in Dev using Run, my programs' window is maximized like it should be. But when I run the program by double clicking, it runs in a normal window.

Has anyone else experienced weird things like this?

Here is my window creation data:

Code:

---

hwnd = ::CreateWindowEx(
          0,                  /* Extended styles */
          "Form",        /* Classname */
          s.c_str(),      /* Title Text */
          WS_OVERLAPPEDWINDOW | WS_MAXIMIZE,
          0,//CW_USEDEFAULT,     
          0,//CW_USEDEFAULT,
          1000,               
          700,               
          HWND_DESKTOP,        /* The window is a child-window to desktop */
          NULL,                /* menu */
          This,      /* Program Instance handler */
          this    /* Window Creation data */
          );

---