About file selectors 
When the button on a file selector is clicked, the standard browse/open file dialog for the user's operating system opens. 
File selector when drawn: 
File selector when used: 
  
 
  
Adding file selectors 
1       Choose Fields > Selectors > File Selector. 
2       Add this field to the form. 
Make the field long enough to accommodate the full path and file name of the selected file. 
3       Update the "Text" field on the Contents tab of the Field Attributes form, if you want to supply a default file. 
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