Edit: I'll try with ShellExecute_(0, 0, sProgram, 0, 0, #SW_SHOW) with a pause in the cmd, to check that it is really not executed.
Case TB_Message ; Message TaskbarCreated received Sleep_(100) ShellExecute_(0, 0, sProgram, 0, 0, #SW_HIDE) Case 800 ; 0x320 ! workaround to TaskbarCreated Message for 8.1PE. Send once at startup and at explorer restart. Also, not sent in7PE, real OS. Sleep_(100) ShellExecute_(0, 0, sProgram, 0, 0, #SW_HIDE)
Not sure what native RunOnce is?