Forms :: Opening A Word Document Via A Button Control On A Form?

I would like to open a Word document using a button control on a form to a file path listed in a field on the form. I use the following code when I want to open a single specific document...

Dim wdApp As Word.Application, wdDoc As Word.Document
On Error Resume Next
Set wdApp = GetObject(, "Word.Application")
If Err.Number <> 0 Then 'Word isn't already running
Set wdApp = CreateObject("Word.Application")
End If
On Error GoTo 0
Set wdDoc = wdApp.Documents.Open(File path here)
wdApp.Visible = True

...but in this case the file path I want to use will be designated by a field on the form. I know I could just use a hyperlink but I don't like the way it looks on the form. I would rather hide that field and have code pull that path when I hit the button.

So how would I change my code to make it so the value in the file path field on the form goes in where it says "File path here" in my code above?