Rich Text Box / Load File

Good afternoon/evening,

How can I load a file with an application path
app.path)into a Rich Text Box?

For Rich Files:
RichTextBox1.LoadFile App.Path & "\MyRTF.rtf", rtfRTF

'or

For all files:
RichTextBox1.LoadFile App.Path & "\MyTXT.txt", rtfText

Thanks Matthew!!!