Setting filename property for TOpenFileDialog

Question

When I set the Filename property of a TFileOpenDialog and then execute it I see just the final 14 characters of the filename selected in the Filename field. If I press Home I can see that the entire string is there, but I'd like it to display properly of course. I've tested on two Windows 7 and one Windows 8 machine with the same results. Does anyone have any suggestions or hints on how to solve the issue?

FileOpenDialog1.FileName :=
  'C:\Program Files (x86)\Embarcadero\RAD Studio\9.0\available_downloads_en.htm';
if FileOpenDialog1.Execute then
  ShowMessage(FileOpenDialog1.FileName);

Initial display showing problem:

The entire string after pressing Home:

Answer 1

TFileOpenDialog is just a thin wrapper around Microsoft's IFileDialog interface on Windows Vista and later. You don't have control over how the dialog itself behaves when it is shown. If it only shows the last characters (and I was able to reproduce that behavior on my Win7 box), than that is simply how the dialog works in general. However, with that said, IFileDialog does allow the absolute folder path and just the filename to be set separately, and that is how they should be used, but TFileOpenDialog does not make or expose that separation, unfortunately (Embarcadero bug?). So if you need that functionality, you will have to use IFileDialog directly and not use TFileOpenDialog at all.