The system restricts which processes can set the foreground window. A process can set the foreground window only if one of the following conditions is true:
- The process is the foreground process.
- The process was started by the foreground process.
- The process received the last input event.
- There is no foreground process.
- The foreground process is being debugged.
- The foreground is not locked (see LockSetForegroundWindow).
- The foreground lock time-out has expired (see SPI_GETFOREGROUNDLOCKTIMEOUT in SystemParametersInfo).
- No menus are active.

מההודעה קצת לא הבנתי מה אתה עושה, אתה מנסה לפתוח קובץ מה-Explorer ואז לעשות שהתוכנה שלך תהיה בחזית?

מה התוכנה שלך עושה בעלייה? היא כנראה לא הופכת להיות ה Foreground process