Display customized help on Windows Open File Dialog rather than default Windows Help

Hi,

I'm working on Visual Studio Extensibility. I have a scenario where, upon clicking on a custom context menu I open the Windows Open File Dialog (Custom Open File Dialog).

Now, upon pressing the F1 key while the Custom Open File Dialog is open, the Windows Open File Help pops up.

What I want to achieve is that upon pressing the F1 key while the Custom Open File Dialog is open, I want to pop up my custom help instead of the default Windows Open File Help. How do I do it?

I tried looking for any methods under OpenFileDialog, FileDialog, CommonDialog, to override and then display our help, but couldn't find the same.