EXCEPTION_DEBUG_EVENT An exception occurs in the debuggee process. Important: This event will occur once just before the debuggee starts executing its first instruction. The exception is actually a debug break (int 3h). When you want to resume the debuggee, call ContinueDebugEvent with DBG_CONTINUE flag. Don't use DBG_EXCEPTION_NOT_HANDLED flag else the debuggee will refuse to run under NT (on Win98, it works fine).