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How can I create the autocomplete for the function with opening file selection dialog? For example like a autocomplete of the SystemOpen

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UPD: the answer to the question is contained in this post

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  • $\begingroup$ See the “custom autocompletions” section. The number you pass to FEPrivate`AddSpecialArgFunction or whatever it is is like 3 I think. It’s undocumented but on the site somewhere. $\endgroup$ – b3m2a1 Aug 18 '18 at 21:28
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    $\begingroup$ @b3m2a1 Where can I find the "custom autocompletions section"? $\endgroup$ – C. E. Aug 19 '18 at 8:36
  • $\begingroup$ @C.E. Sorry I meant question. Szabolcs has one like this. $\endgroup$ – b3m2a1 Aug 20 '18 at 4:32
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    $\begingroup$ @b3m2a1, You could just leave a link and say that this is a related question, instead of hinting that somewhere there is something similar mathematica.stackexchange.com/questions/56984/… $\endgroup$ – Kirill Belov Aug 20 '18 at 6:58
  • $\begingroup$ @KirillBelov I didn’t have time to track it down when I left that comment $\endgroup$ – b3m2a1 Aug 20 '18 at 13:36