I can select SINGLE file in $file
but how to multi-select file?

You can't select more than one file with $sfile(). An extension was suggested before, so lets hope it will be added to the next version.

As for now, FileSelect.dll provides a partial solution as only its "old" interface allows multiple selection.

mmm.. It's wonderful!
Thank you!

You may like EDialogs.dll better.

Thank you, Nimue!
I think this one is perfect!