Mathematica 10 introduced file name completion. It works with many functions, such as
SetDirectory, etc., though there are some oversights: it doesn't work with
SemanticImport and it doesn't work for paths relative to
Directory if the current directory is changed.
Question: Is there a way to enable to enable file name completion for user defined functions?
Say, I have a function
importFormatX[file_] := ...
I would like file name completion to be triggered when I type
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