Getting "The Page Cannot be displayed errors" when loading PDF file in Web Browser Control

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VB

WebBrowserControl

Adobe

I have a VB.net app that displays PDF files in a web browser control. The app runs fine on my WinXP development box, 2 WinXP embedded test boxes and a Win2000 test box. I recently tried it on another Win 2000 box and I am getting a “The Page Cannot be Displayed” errors in the web browser control after navigating to a page. When I scroll down to bottom of the error it says “Cannot find server or DNS error”. If I open an IE browser and paste a path of the PDF file in the address bar, the PDF is displayed properly. Why can’t I see a PDF in my Web browser control when it works properly in IE? The only real differences I can see between the 2 Win 2000 test boxes is that the one that works has Adobe 8.1.1 and the one that doesn't work has Adobe 8.1.2.

Here is a copy of the code I'm using to display the PDF:

Dim sFilePath As String = "c:\temp\testpdf.pdf"
WebBrowserWebContent.Navigate(sFilePath & "#toolbar=0&navpanes=0")