[Rhino6/RhinoCommon] File import plug-in does not get correct file type index for dropped file

@menno wrote:

I just noticed that when a file import plug-in has multiple file types declared, that when a file gets dropped onto Rhino the index in de ReadFile method is incorrect. When the file gets opened from the File>Open or File>Import menu, the problem does not appear.

When I drag a file with extension .dat onto Rhino when the file import plug-in (see below for code) is loaded, I get the following:

Observed output

Received index 0
TXT file

Expected output

Received index 1
DAT File

private int txtIndex, datIndex, wordIndex;

protected override Rhino.PlugIns.FileTypeList AddFileTypes(Rhino.FileIO.FileReadOptions options)
{
  var result = new Rhino.PlugIns.FileTypeList();
  txtIndex = result.AddFileType("Text file (*.txt)", "txt");
  datIndex = result.AddFileType("Data File (*.dat, *.plt)", "dat", "plt");
  wordIndex = result.AddFileType("Word Document (*.docx)", "docx");

  RhinoApp.WriteLine("TXT index {0}", txtIndex);
  RhinoApp.WriteLine("DAT index {0}", datIndex);
  RhinoApp.WriteLine("WORD index {0}", wordIndex);
  return result;
}

protected override bool ReadFile(string filename, int index, RhinoDoc doc, Rhino.FileIO.FileReadOptions options)
{
  bool read_success = false;

  RhinoApp.WriteLine("Received index {0}", index);

  if (index == txtIndex)
    RhinoApp.WriteLine("TXT file");
  else if (index == datIndex)
    RhinoApp.WriteLine("DAT file");
  else if (index == wordIndex)
    RhinoApp.WriteLine("WORD file");


  return read_success;
}

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