Specifies which of the file filters is highlighted in the file common dialog box when the dialog box first opens.
Image Admin control
object.FilterIndex[=index]
Long
If no filters are specified by the Filter property and the FilterIndex property is set to 0 (zero), then a default filter will be highlighted. If a different filter is selected, the index still remains set to 0.
If a value was set for the Filter property, and a different filter is selected, the index will be updated to reflect the selected filter.
The default value is 0 (zero).
Filter property
ShowFileDialog method