hey guyz, I am new in this community , As My query is i have created a window which will be having Combo Box which will be activated when a checkbox is checked , then i have already listed the files with extension from a folder view using _GUICtrlComboBox_BeginUpdate($VDID_1) _GUICtrlComboBox_AddDir($VDID_1, $dir1 & "\*.SCP") _GUICtrlComboBox_AddDir($VDID_1, $dir2 & "\*.SCP") _GUICtrlComboBox_AddDir($VDID_1, $dir3 & "\*.SCP") _GUICtrlComboBox_EndUpdate($VDID_1) aft