1. Choose Exras -> Customize toolbar...
2. Click 'Details' column of a item on left-down item list.
3. Click '...' button of right side of filename input field.
4. Choose 'Seek icon file...'.
Result:
FileDialog will be opened at behind of 'Define action toolbar' dialog.
There is a workaround, I can input file name directly. So priority is low.
