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Automatic header convertors tend not to be very effective in my experience. Don't expect to be able to get a working import unit without human intervention.

On Windows 10 1903.18362.476. Also your code doesn't `CoUninitialize` if IIDL is nil. ..and what does GetLastError say when you get IIDL=nil?

If the Visual Studio project has a .h file with the same function declarations as the DLL, you should try Dr Bob's HeadConv or a more modern alternative if you can find one.

If you have a demo program written in C or C++ then it is easy enough to translate to Delphi. But you'll want to learn some basic C or C++ in order to do so.

Without documentation about the parameters of these functions and their types, you will be unlikely to succeed.

In german language, we call this "putzig": It is indeed an error in the forums-software related to the recent change of the year. So kind of a "year 2020 bug". I do have a bugfix and will it apply this evening. Other customers reported a successful patch - so I think it will work here also.

@Mike Torrettinni Check my demo app (attached). Works as needed in Windows 7 (I haven't Win10 here, sorry). Look at the project source: program SplashApp; uses SysUtils, Vcl.Forms, uSplashMain in 'uSplashMain.pas' {Form1}, uSplashForm in 'uSplashForm.pas' {Form5}; {$R *.res} begin Application.Initialize; Form5 := TForm5.Create(nil); try Application.MainFormOnTaskbar := True; Form5.Show; Form5.Update; Application.CreateForm(TForm1, Form1); Sleep(3000); finally Form5.Free; end; Application.Run; end. Form5 is a splash form, and Form1 is a app's main form. Also check menu Project | Options | Application | Forms. The splash Form5 is in the list of available forms (the right list). SplashApp.zip

I tried this suggestion for Delphi 7, and it still works in Rio and Windows 7. In TForm5: protected procedure CreateParams(var Params :TCreateParams); override; ... procedure TForm5.CreateParams(var Params: TCreateParams); begin inherited; Params.ExStyle := Params.ExStyle OR WS_EX_APPWINDOW; end;